A unique botanical garden housed in three giant geodesic domes.

A giant, Gilded Age mansion that once belonged to the beer baron of Milwaukee.

A place to eat for on-the-run agents and espionage enthusiasts.

This striking art museum holds an amazing series of curiosity cabinets.

The bugs crawling down the front of this office building are almost as big as a '68 VW Beetle.

Statue dedicated to the star of an old television show.

At 207 feet, one of the world's longest continuous escalators.

A building so large that it has its own weather.

A vertically floating hemlock controls the waves and weather at Crater Lake.

A toweringly silly piece of modern art has been delighting locals since the 1980s.

Lines from a walking song are etched into a rock in Natural Bridge State Park.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

The former home of Samuel Clemens and family remembers the happiest period of the author's life.

A turn-of-the-century architectural marvel built on healing mineral springs and salt licks.

Tracks near this Texas nature site were once thought to support the Creationist belief that man and dino coexisted.

A museum within a museum, devoted to history's most questionable medical devices.

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

Visitors can walk over the largest concentration of Columbian mammoths to have died from one event.

The unbelievably opulent home built for an infamous newspaperman.

This large midwestern cavern features impressive rock formations and an underground waterfall.

The Grand Canyon of Texas.

The eccentric mansion of one of the most popular horror authors of modern times.

A sculpture made of 10 Cadillacs as a monument to the “Golden Age” of the American automobile.

Florida might be at its most surreal in this museum devoted to the famed Spanish artist.