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

Nuclear waste dump site now an environmental sanctuary.

Hide from the tourist hordes in these relatively unknown, and unguarded lava caves.

Life-sized sculpture of a blue whale made of hand-recycled plastic trash.

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

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

This quirky roadside attraction dives into the many theories surrounding North America's most infamous hairy cryptid.

A cave's rare beauty held a cavernous secret hidden underground.

A recreation of the doomed ocean liner in the middle of the Smoky Mountains.

A volcanic tunnel illuminated by natural skylights offers a shaded respite from the desert sun.

A Texas cave network is home to some of the world's most spectacular-looking and bizarrely named mineral formations.

The remains of the iconic train crash from the movie The Fugitive can still be found rusting along the Great Smoky Railroad.

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

This spectacular track has run continuously since 1882.

Once thought to be the oldest living tree in the world, Methuselah was germinated before the Egyptian pyramids were built.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

Eons old volcanic activity created one of the most stunning rock formations in the United States.

Canyon walls shrouded in ferns.

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

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

Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.

The world's longest known cave system.

Odd outsider art installations surround a Gold Rush-era ghost town.