A beautiful geyser under environmental threat.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The first declared National Monument in the United States.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

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

The history and future of cannabis.

The real life town from the Pied Piper of Hamelin has a mechanical puppet show that retells the famous story many times a day.

The Nazis lost more men trying to take this Russian-held Stalingrad apartment block than they did when taking Paris.

Stalinist skyscraper built with help of cryotechnology.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

The oldest museum in Russia is home to a fascinating collection of nearly two million anthropological artifacts and anatomical curiosities.

Home to Hollywood history and a very special salt crystal.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

Twenty-seven massive radio antennas on the high plains of New Mexico search for life on other planets.

Home of the International Space Hall of Fame.

A museum dedicated to the alleged Roswell Incident.

Twice a year, visitors can tour the desolate site that birthed the Atomic Age.

The official atomic museum of the United States explores the explosive and productive history of a much maligned energy source.