A 10 million-ton rock once worshiped by the Tahamies Indians, accessed by an astounding staircase.

An ancient city hidden in the heart of the Sierra Nevada mountains.

Colorful lights and mirror-like brine pools create trippy illusions within the historic mine.

The caldera of this mini-volcano has been turned into a naturally heated mud bath.

Unparalleled stargazing, one of Colombia's best observatories, and a swimming pool can all be found in the middle of this ancient tropical forest.

Enchanting cave with a river crashing through the roof.

The Andean town where every single building is decorated with a brightly colored frieze.

This picturesque mansion has gone from opulent ruin to nature museum.

A dangling church built over a Colombian gorge.

An explosion of natural color known as "the river that ran away from paradise."

The geographical center of Chile is a port so depressing that it has driven men to suicide.

The rusty hull of this 1899 ship serves as a tribute to explorers of the bottom of the world.

Half of a waterfall goes into the river while the other half seems to disappear.

This large midwestern cavern features impressive rock formations and an underground waterfall.

A quarter-scale locomotive wonderland built by one man and his family.

What was once the largest NFL stadium.

A crumbling mountain resort that looks like it was abandoned in an instant.

The bones of an old zoo crumbling in the shadow of a new one.

The structure has welcomed visitors to this scenic harbor city on Lake Michigan for many decades.

This elaborately-carved white marble fountain was built to stand outside the Detroit Opera House.

A lonely stone-sided terminal stands next to a grass airstrip on Michigan's Leelanau Peninsula.

An easy-to-reach, century-old shipwreck in shallow and crystal clear waters.

This vacant station is a relic of harvest processing techniques of the mid-20th century.

Where most of the world's flypaper was made.