Most-visited and most-photographed slot canyon in the American Southwest.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

You'll find just about anything in this funky Tbilisi flea market.

Ancient rock-hewn town that witnessed key events of Georgian history.

A propulsion engine testbed that paved the way for the Space Shuttle launch sits without recognition at this rocket center.

It may look like no more than a full-scale model, but every part of this full Space Shuttle stack had a working role in aviation history.

A 30-mile-long glacially-carved canyon leads to a massive pair of glaciers.

The remains of a Canadian train crash are now mouldering beneath layers of rust and graffiti.

The floor of the oldest surviving synagogue in the Americas is entirely covered in sand.

This functioning mill was built in the 1970s using parts from several other West Virginia mills.

This rural community has attracted both scientists and techno-refugees due to its federally-mandated lack of technology.

The world's largest fully steerable radio telescope.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

Constant erosion has created a surreal landscape of bleached and preserved fallen trees.

An underwater statue of Christ blesses the coral reefs off Key Largo.

Wading through a small lagoon reveals a secret, wild stretch of pristine beach.

Elevated freight railway turned wildly successful urban park.

One of the world’s largest suspended aquariums, located in Dubai Mall.

The world's largest frame offers spectacular views of the city's past and present.

This futuristic building is yet another architectural wonder in Dubai.

A preposterously luxurious hotel with gold-plated iPads, Rolls Royce chauffeurs, and a staff that trains by watching "Downton Abbey."

Whitewashed mosque contains the world's largest carpet.

On any given day this sprawling market houses literally tons of government-regulated gold, gems, and precious metals.

This indoor ski resort has a mountain contained inside a mall.