One of the world's tallest Ferris wheels takes visitors high above Las Vegas in a spinning party room.

Golden Gate Park's historic collection of plants.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

The unbelievably opulent home built for an infamous newspaperman.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

A luxurious 1880s hotel with its fair share of Tiffany stained glass, Edison electricity, and of course, ghosts.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

An homage to everyone's favorite prehistoric cartoon family.

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

A collection of 20th-century automata, penny arcade games, and musical contraptions.

European castle ruins in an American state park are actually the product of death and grief.

Less a museum than a bizarre fantasy world created by artists and engineers.

See massive fossils that are over 200 million years old in northeastern Arizona.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

Scores of vintage street lamps shine along L.A.’s Miracle Mile.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

A hotel and restaurant serving as the mecca of kitsch.

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

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

Home to items never before seen by the public.

Where manatees are the snowbird vacationers in these balmy Florida springs.

Possibly the most beautiful carillon in the world, set atop Iron Mountain in Florida.