Every fall this lake mysteriously drains, like a bathtub with the plug pulled out.

Glacial lake that mysteriously empties itself every year.

Iconic rock formations that allow for exploration during high or low tide.

One of the largest ancient geoglyphs in the world is a tall desert god used for predicting the weather.

Mysterious standing stone formations looks like a petrified forest.

The highest point in Arizona is an oddly snow-topped peak within the otherwise arid state.

Granite rocks that concentrate waves into powerful jets.

After millennia of erosion by sand and churning water this Brazilian valley now looks like a lunar fantasy.

Beneath the surface, something slithers. And if you find it, prepare to be slimed and glowing.

The winter home of millions of migrating monarch butterflies.

The first full-scale tunnel built in America is short but scenic.

World's strongest whirlpool.

The field of tiny caves that mark this Chinese cliffside are each their own historic Buddhist temple.

Mineral springs believed to hold therapeutic properties draw in visitors from all over.

A mud volcano in Indonesia spews out 50,000 cubic meters of mud every day.

Pre-Incan aqueduct amidst a stone forest in Peru.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

A landscape of massive spherical boulders are the main attraction in this Kansas State Park.

This Peruvian canyon is filled with geometric salt pools that have been being harvested since the Incan empire.

Raging waters have created a strange geological site that looks like something off of a progressive rock album cover.

This Italian dam is covered in salt-hungry goats who manage to scale its almost vertical face.

An ocean in the making, in the Ethiopian desert.

Rusty red sands line the shores of this Canadian Province.

The largest tidal whirlpool in the Western Hemisphere.