They are actually Caverns! Created from thousands of years of limestone buildup! the most Famous caverns in the world are in South Eastern New Mexico! They are called: "Carlsbad Caverns" and it is a National Park!
You find them
New York City.
New York City
New York City
Mostly caves otherwise bark or sticks and ferns or huge leaves.
huge
Texas
A huge lake
New York City
He has a huge crush on Megan Fox.
for having a huge tsumami
Central Plateau