I highly recommend this one as well. Lots of AAA titles will get mentioned here, but the Daymare Town series is a really fun, highly atmospheric game. And it's free.

Here are some more adventure classics:
3 Skulls of the Toltecs
The 7th Guest
The Adventures of Willy Beamish
The Big Red Adventure
The Black Cauldron
BloodNet
Bud Tucker in Double Trouble
Chewy: Esc from F5
Code-Name: Iceman
The Colonel's Bequest
Companions of Xanth
Conquests of Camelot: The Search for the Grail
Conquests of the Longbow: The Legend of Robin Hood
Cruise for a Corpse
Curse of Enchantia
The Dagger of Amon Ra
Dune
Déjà Vu II: Lost in Las Vegas
EcoQuest: The Search for Cetus
Eric the Unready
Fable
Gold Rush!
Heart of China
Hugo's House of Horrors
The Island of Dr. Brain
It Came from the Desert
The Last Express
Les Manley in: Search for the King
Loom
Lure of the Temptress
Mixed-Up Mother Goose
The Oregon Trail
Rise of the Dragon
Shannara
Teenagent
Toonstruck
Touché: The Adventures of the Fifth Musketeer
Veil of Darkness
WaxWorks
Zak McKracken and the Alien Mindbenders

"The Secret of the Monkey Island"!

Gabriel Knight 3 and 2. I still have not played the first but I have it (the original, not the new one).

It was...........well it will..............well.............it was mentioned but in the future of this thread. Someone else landed on the past but the thread wasn´t even created yet.

If you like immersive, I HIGHLY recommend the Cognition series. SO GOOD! Here's my review just for the first chapter (no spoilers):

I highly recommend having the hints and tutorials ON the first time you play... and maybe subsequent times, as well These are not invasive at all, and it's important to understand the mechanics, which are not your basic adventure fare! OK, some are pretty basic. For instance, click on an active item and see a circle with one to three options: An Eye (the better to see you with my dear!) a Hand to physically interact with things, and a Suitcase, which is how you use your inventory. Whatever item you have showing in the top right corner is the item which you'll try to use when you click on that suitcase button.

So how to change the inventory item? Click on the square box at the top right of the screen to open your inventory. Now you have three options (again? Yes, again!) There's an Eye (same as above), a Hang (yes... same again!) and a Plus Sign, which is what you use to combine items.

Sound complicated? It's really not, it just takes a little bit of getting used to.

Back to the inventory, you select your "active" item (the one you're currently holding) by simply clicking on the item you want. You don't have to click on any of the options to change what you're holding.

Double-clicking will make Erica run (yay!) and when we click on an exit, you automatically leave the scene -- we don't have to wait for her to walk over there. Very much appreciated!

Hold down the space bar or click and hold the question mark at the top left of the screen to show you the active areas in the scene(s). Also at the top left are quick access to your cell phone (much easier and faster than accessing it through your inventory!) and clicking on the computer image will take you back to the main game page where you can SAVE SAVE SAVE! I recommend doing this often! For one thing here are choices you can make that will affect gameplay, and you may want to do things differently the next time you play. In the end you will find yourself in the same place, but the journey will differ depending on your actions. Second is that you can -- and will -- die. You get to replay this sequence as often as you need to, but still... knowing that you can die makes things a little nerve-racking!

Your cell phone will be invaluable to you. You use to search the web, look up music, make phone calls (of course,) take pictures, look at the calendar, and make NOTES. Yes, you make your own notes. There is no journal -- if there's something you want to remember, be sure to add it to the notes in your phone. There is one other option: Message Dad. Sending messages to Dad is how you get HINTS in the game, and they are truly HINTS, and not just telling you exactly what to do.

The art style is probably the first thing you notice about the game. They are very graphic novel-esque, with cartoon-like cutscenes. Don't let that throw you off! The voices and mannerisms of the characters are so beautifully done, and the story so intensely interesting that you quickly become immersed in this world. I'm kind of glad that the graphics aren't any more realistic than they are, as it would be just too much for me, I think. I'm so impressed with how well Phoenix Studios integrated realistic human movements into the characters, right down to the way we tend to rub our fingers together to get the salt off after we've eaten a potato chip. VERY NICELY DONE!

The story itself is gritty and dark, as would be expected with a real life-type environment. We have horrible antagonists, strong personalities, some f-bombs, and semi-disturbing imagery. It's not gory but do expect to see things you would see on a crime-type TV drama.

Speaking of which, our forensics guy and someone we interrogate remind me strongly of characters in Criminal Minds, and that's an apt comparison since the game kind of plays out like this TV drama: Intense, full of personality, and very interesting.

Ahh, I just realized that I haven't mentioned what's so different about the gameplay, yet! Haha, there's just so much to mention! What we have is a psychic detective! As we progress through the game, we learn new ways to use our abilities. Hopefully you've got your tutorial on so that you'll learn what that's all about! To use your abilities, you click on the glowing ball at the bottom left side of the screen, then click on the item(s) you want to learn about and click on the ball (which will now have an image in it) again.

The psychic abilities are, I think, what really makes this game stand out for me. It's so beautifully and seamlessly done... I'm just so impressed.

For me the gameplay was very intuitive, and I love not only being able to make my own choices about how the story plays out, but also that there is freedom to explore as you wish. Yes, it if was more linear I wouldn't be traveling around so much, but in this game, I really LIKE that I had this freedom!

I admit that I had to use the walkthrough a few times... mostly because it took me more than one sitting to play the game, and I forgot some things. Twice, though, I got completely stuck despite the walkthrough. The first time was my own stupidity, and the second was because I didn't even think to try the solution. Silly me. :p

If you enjoy being immersed, I definitely recommend checking out the series!

... and don't even get me started on The Walking Dead. ♥ lol~

I love old classic Sierra gems...
LSL series
Broken sword series (don`t forget Community created Broken Sword 2.5)
Laura Bow: dagger of Amon Ra...

I probably have to say Sanitarium. It's the only adventure game I've ever beaten without having looked at a walkthrough even once. Not only because it was easier than any other adventure game I've ever played (or rather less frustrating because the areas are rather small and you never have too many items in your inventory) but also because the scenario, story and atmosphere really sucked me in so much that I was willing to spend more time just walking around, exploring and trying to figure stuff out.

My favourite adventure game from my childhoold was probably Woodruff and the Schnibble of Azimuth, kind of a successor to the Goblins series. I'm very sad that it's not here yet because I only played the German version and its voice acting was *very* hit and miss. Anyway, totally loved its style and humor. And the game world was highly original to say the least. Oh yeah, and I never fully beat it.

Another adventure game I loved very much was Torin's Passage, I actually played through it with a friend. We actually sat together at a computer using mental team work to get ahead. It was great. :)

Ohhh, well, if we're going to go childhood favorites, then I have a lot more to say! lol~

The old Windham Classics adventures for C64 -- specifically Alice in Wonderland and Below the Root - were definite favorites. Swiss Family Robinson was good, too, but if you it was Permadeath, and sometimes just walking on the wrong piece of map would get you killed (D'oh! Quicksand!), and that lessened my enjoyment just a bit ;D

Text adventures were faves on the Apple II, especially The Wonderful World of Eamon games. Again, Permadeath, but I enjoyed them so much that I didn't care. I was happy to go through and play The Beginner's Cave every time I died, then try again :D

I found an absolutely fascinating text adventure 10-12 years ago, and sadly, I can only remember fragments of it -- Not enough to ever find it again! :( Going to sleep and waking up in a dream-type realm that had a red moon, the ocean, being up in the trees, crystal caves, the hut with spiderwebs in the corner that my character couldn't go near... Fantasy and intellect all wrapped up in one story-text adventure. Geez I wish I could remember what the darned thing is so I can play it again! >_<

My favorite adventures are the Gabriel Knight series.

Some other memorable ones (the ones I played):

Torin's Passage
Sanitarium
Riddle of Master Lu
The Orion Conspiracy
Blue Force
Prisoner of Ice
Lost Eden
Normality
Chronomaster
In Cold Blood
Under a Killing Moon
The Secret of Monkey Island
Day of the Tentacle
Full Throttle

I recently saw a video of Alien Incident which looks kinda cool, reminded me of Day of the Tentacle.
Don't know if action adventures or other hybrids count but otherwise I would include Another World, Flashback and Bioforge as well.

The Monkey Island games are my favourites with number 2/3 pulling even for me,

Then there are such classics as
Full Throttle
Discworld 2
The Dig
Toon Struck
Fable (1996)
Broken Sword 1 & 2
Beneath A Steal Sky

By the way if you think Alien Incident is a cool game too it can always use more votes.

http://www.gog.com/wishlist/games/alien_incident

of GoG click & point adventures, I'd recommend:

Amerzone
Atlantis games
Sam & Max series (Telltale games & the original)
Broken Sword series
Botanicula
Darkfall 3
Gabriel Knight series
Machinarium
Myst series (especially Riven & realMyst)
Lilly Looking Through (if you catch the 1.99 sale, Its lovely but short!)
Deponia series
Gomo (on sale, its also short)
Indian Jones adventure game
Journeyman Project series
King's Quest series
Legends of Kyrandia (with a WT!)
Night of the Rabbit
Zork series, especially Zork Grand Inquisitor
Runaway series
Sanitarium
Simon the Sorcerer 1& 2
Space Quest series
Syberia 1 & 2
Tex Murphy series
To the Moon

not available on GoG right now but worth running down

Discworld 1, 2, & Discworld Noir (especially if you've read the books)
Grim Fandango
Darkfall 1& 2
Lost Crown
Maniac Mansion & Day of the Tentacle
Freddy Pharkas: Frontier Pharmacist
Eric the Unready
Riddle of the Sphinx, Omega Stone
Laura Bow
Schizm, Mysterious Journey II
Timelapse
Zak McKracken
Agatha Christie's Evil Under the Sun & Murder of the Orient Express

Personally, I like the Nancy Drew adventures too :)

There's more but that should keep you busy for quite awhile!

The Bizarre Adventures of Woodruff and the Schnibble
KQ Series
Laura Bow Series
GK Series
Hugo Series
Leisure Suit Larry Series
Full Throttle
Dig
Manic Mansion Series
Lost Crown
Dark Fall Series
Gobblins Series
Lost in Time
Neverwood
Space Quest Series
Quest for Glory
Police Quest Series
The Last Door
Discworld
Agatha Chisies Series

and soooo many more
oh yes and this too as well as everything else listed!

Not going to list every Adventure game I like (especially since I would be repeating many that were previously mentioned) so will just focus on the ones that stand out the most to me.

In no particular order:

Gabriel Knight 1: The origin of the series, and what an immersive game it is. I had to use a walk-through for a couple of puzzles due to not having ever encountered anything like them prior (just my own personal experience). Also, I believe it is the best of the trilogy. The other two are good but this one just has a charm that they have not matched.

Sanitarium: This is one of the most unique adventure games you will ever play. Played this in undergraduate, and some of my neighbors in the dorm were freaked out by the voice-overs for the menu options screen! Also, the chapter titled "Innocence Lost" or something like that with all the children in a mid-western town setting. Just two of the many stand-out moments of this game. I had to use a walk-through (and then use help from friends) to solve the one sound-based puzzle because of my hearing disability (just could not distinguish the individual tunes enough I guess). One of my favorites. To me, this game is the Adventure genre equivalent of one of those timeless literature classics that everyone needs to read.

Monkey Island series (particularly Curse of Monkey Island): Humor in the first three are very very good but 3 wins over the other two easily. That one makes the list just for doing the comedy so well. I really really hope that one comes to GOG someday.

The Longest Journey: Lives up to its name. Not because it seems so long by dragging on, but because I notice that it seems relative to other adventure games it kept going and going. Very engaging story and memorable characters and voice-work, and for as long as it takes to complete this game that is not only a good thing but a necessity. Still, you will have fun with it. Enjoy the journey!

I have plenty of other adventure games here on GOG, many of which I have yet to play let alone finish, but for now I will just leave it at those four. Will edit if I can think of any others.