A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

Famously misunderstood wonder of the ancient world

This incredible collection of vintage pinball machines can be played at 25 cents a pop.

If drivers cross the rumble strip on this stretch of Route 66 at just the right speed it plays "America the Beautiful."

A modernist landscape of water and sci-fi concrete.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

360° views of the city plus five floors of optical illusions and hands-on science.

The "Seinfeld" diner.

Make your reservation to have coffee with some kitties.

A heavenly experience, right here on Terra Firma.

Towering basalt columns, a creation of fire and ice.

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

The rocks in this arid basin leave trails of movement behind them.

This frequently-photographed waterfall takes only a short hike to visit.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Take a drunken tour inside the world's largest known geode.

A favorite haunt of dinosaur loving children and hallucinogen loving hippies alike.

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

A 30-acre garden inspired by the principles of modern physics.

A library of rare occult books in Los Angeles.