A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

The world's first commercial spaceport is a disappointment of cosmic proportions.

An underwater road considered a possible Atlantis location.

One of the deepest blue holes in the world.

An island filled with hundreds of hanging, decomposing, decapitated dolls.

How a lunch counter in Chile became a shrine to the 42nd president of the United States

More than 450 years ago, an Italian nun became the first woman to paint the iconic subject.

Over 50 exquisite hand-painted Renaissance maps decorate a Medici storage room.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

Bootleggers ran booze beneath this building before (and after) Route 66 appeared beside it.

Walk through the actual strap iron cells and solitary chambers of Arizona Territory’s first prison.

A wild west cemetery in Tombstone, Arizona, provides a window into the Old West.

The world's largest military aircraft cemetery.

Dramatic river bend surrounds a natural red-rocked pedestal.

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

A small oasis not far from downtown Moab.

A tunnel with windows, so you don't miss out on the impressive views.

The fifth-longest natural arch in the world, and the longest outside China.

A house carved into a rock in the 1940s.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

Home to items never before seen by the public.

The world’s largest combined collection of U.S. and Russian aircraft got its start in a poultry building.

The Bucyrus-Erie model 1850B electric shovel, or "Big Brutus," the largest existing electric shovel in the world.