The Secret of Monkey Island in one of the best adventure games available. This piece, is the prequel to other 3 games from this series, but for many people this is considered to be the best one.

You play Guybrush Threepwood, a young man who has a vision - becoming a pirate.
Aiming for his goal, Guybrush heads on to Melee Island, and there is where he meets Lechuck, a very vicious pirate ghost.
Guybrush faces a challenge - in order to become a pirate he will have to expertise in a areas, suitable for pirates: stealing, swordfighting and treasure hunting.
Unfortunately, Lechuck kidnappes the beautiful governor of Melee Island - Elaine Marley, and he's keeping her in the misterious island - Monkey Island.
This is where our hero, Guybrush, enteres the picture, in order to save the beautiful governor and live happily ever after.

Nowadays, more than 15 years after the first game was released, Monkey Island series is still counted for the best adventure series ever released, and is still discussed all around the gaming forums and communities.
Besides the great detailed animations, the game introduced us the SCUMM engine (who was originally coded for the Maniac Mansion series), which enables us to do basic operations, like 'turn off' 'turn on' 'talk' 'push' and more with a click of a mouse.
Another great feature of the game is the little hints about upcoming releases by Lucasfilm Games (later known as LucasArts), which are spread all over the game, that spice up the gaming experience.
If you love adventure game and you didn't play this masterpiece yet, and even if you're not that kind of adventure games fan, this is a must!