Roman ruins top white travertine terraces formed by ancient hot springs.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

An arsenic-filled pool in the Grand Canyon takes on the appearance of a giant, overflowing pumpkin.

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

This attraction was abandoned after the Chernobyl disaster.

The remains of diamond fever taken over by the desert.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

The most alien-looking place on Earth.

Welcome to old Florida, where a 1940s mermaid show is still enchanting visitors.

Explore 10 acres of environmental sculptures.

Natural time capsule containing an alien ecosystem.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

An homage to everyone's favorite prehistoric cartoon family.

An ethereal glowing blue ocean cave in Croatia.

These fantastically named natural pools look like something out of a Scottish myth.

A natural gas leak provides a flickering flame beneath a waterfall.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

A walk through the historic city center, under the streets of Seattle.

Try not to get slimed in Tribeca.

The ghostly remains of an accidental sea.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

Hot springs monkey spa in the middle of Hell's Valley.

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.