This museum-within-a-museum pays tribute to "The World's Most Experienced Airline."

A former Army airfield is home to one of the largest aviation museums in America.

The golden age of flight captured in a downtown airport.

You can dig up your own crystals in the quartz capital of the world.

Get past the gatekeeper's apartment and enter an elaborate hoax of a restaurant with a Masonic feel.

The world's only international cryptozoology museum is host to an unrivaled collection of mysterious objects.

This network of tunnels housed an entire village for years, and even had a hall for screening movies.

An innovative attempt to break a siege in the American Civil War still scars the earth today.

In the middle of an extremely unforgiving and desolate high desert is the most secret military facility in the world.

The largest man-made crater in the U.S. marks the spot where we once tested mining with nukes.

A picture-perfect town, perfect for blowing up.

The contents of this safe survived a 37-kiloton nuclear bomb.

A facility built in 1992 for an underground nuclear test remains in place today.

Thousands of pieces of art have been carved into the rock at the site of an ancient volcanic eruption.

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

This maze-like slot canyon is a unique gem within an already fascinating geological area.

The highest point in Virginia can only be reached by passing through ponies and flowers.

The eroded core of an ancient volcano is now accessible by a short hike.

The wreckage of a deadly bomber plane crash can still be found near an Arizona peak.

Eons ago, a rushing lava river formed this pristine passage through solid rock.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

See 150 million-year-old dinosaur tracks and bones dating back to the Jurassic period.

Singapore's landscaping project is home to 18 incredible Supertrees.

The largest pool at its elevation sits on top of one of the most expensive resorts in the world.