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During the course of the game you'll find four treasure maps. Once you've found the first one you'll trigger a quest to find the other three, and then once you've found all four you'll receive a quest to find the treasure.
Here is where you can find the four treasure maps:
A) In the Spider Cave (Dark Forest)
B) Sold by Mpenzak (Verdistis)
C) On a dead body (Verdistis Sewers)
D) In a cell (Dwarven Halls)
Basically, the maps show a path in the Dark Forest starting at the Warrior's Guild and leading to the cave where the treasure is. Plus, there's a hint for what to do once you're inside the cave: find three spheres and put them in a bowl. The spheres are actually crystal balls
Here is where you can find everything in the treasure cave:
1 - Stairs
They lead out of the cave.
2 - Sacrifice Bowl
This is where you should put the crystal balls
(#9) when you find them. Once you've put all three inside a door will appear to the west.
3 - Door and Lever
When you pull the lever (#3a) you'll unlock the door (#3).
4 - Door and Lever
When you pull the lever (#4a) you'll unlock the door (#4).
5 - Door and Lever
When you pull the lever (#5a) you'll unlock the door (#5).
6 - Door and Lever
When you pull the lever (#6a) you'll unlock the door (#6).
7 - Door and Lever
When you pull the lever (#7a) you'll unlock the door (#7).
8 - Composite Key
The two composite keys
unlock chests in the treasure room (#11).
9 - Crystal Ball
10 - Shrine
When you click on the shrine the wall to the south will open, and a level 35 guardian named Falrog will appear and attack you.
11 - Treasure Room
You'll find a bunch of gold and gems here, plus four chests. Two of the chests are locked, but you can unlock them with the composite keys (#8).
12 - Easter Egg Portal
If you're carrying the correct items, you'll be teleported to the Easter Egg area. This is covered in the Larian Armor entry in the Other Quests section.