This list will make you want to visit these places even more.
It's not Wonderland, but it’s pretty darn close.
What one local Vietnamese man found in the 90s turned out to be the entrance to a massive cave. No one realized he'd stumbled into the world's largest.
The world is full of mystery including the Upton Chamber and other incredible archaeological mysteries that still baffle scientists to this day.
An isolated cave in New Mexico has produced bacteria so old it has powers. And that may help us fighting a growing crisis we have in hosptials today.
These creatures evolved in complete isolation.