The Caves of Wonder is a small tunnel system filled with cave spiders. There are a few level appropriate item drops and a very rare chance at having a named spawn. There exists a heroic and solo version of this instance that are identical in every way short of the difficulty. The instance has no lockout or persistence, so it can be entered and cleared as many times as desired.
The entrance is a lump of ground titled 'a spider mound' when highlighted. It has a few spawn locations and can be difficult to spot as sometimes only a little bit of it is poking out of the ground. All possible entrances are around the mountain surrounded by spiders in the northwestern corner of the Enchanted Lands. Below are the possible entrance locations:
( 374, 30, -842 ) /waypoint 374, 30, -842
( 425, 25, -860 ) /waypoint 425, 25, -860
( 400, 25, -950 ) /waypoint 400, 25, -950
( 330, 25, -960 ) /waypoint 330, 25, -960
( 299, 28, -931 ) /waypoint 299, 28, -931
( 349, 50, -835 ) /waypoint 349, 50, -835
This location entrance is often bugged and 'a spider mound' is found floating above the location. To reach it you must fly or leap on top of it.