Yay I voted. For historical Time travel. :P Sorry, I would love to see Ancient worlds! Dark Ages works too. I'm an Arthurian scholar, what do you expect?

Looks like Outer Space is still in the lead with 27% of the votes, followed very closely and almost neck-to-neck (at least at the time of this posting) with

Mysterious Locations (Bermuda Triangle, Stonehenge) - 11%
Other Dimensions (the Astral Plane, Faerie, the Netherworld) - 11%
Historical Time Travel (ancient Egypt, Dark Ages) - 11%
Future Time Travel (high-tech future, post-apocalypse) - 11%
Alternate Earth (alternate reality, alternate history) - 10%

I can do Outer Space too. My main character is an alien. Sometimes ET needs more than just phone home. :)

I chose mountain top monasteries, hidden valleys. I guess its the mountain climber in me. I was always hoping to find a secret entrance to a mountain top monastery or a secret village in a hanging valley. oh well.

That probably would have been my second choice!
How cool is that? Secret/ancient hidden valleys, temples, ect. Brings out the Indiana Jones in all of us. 8)