This Boeing KC-97 tanker is now a restaurant for aviation lovers.

Part of a secret 1970s nuclear defense program is now open to the public.

The taxidermy remains of the most popular pony in children's literature.

A museum dedicated to restoring vintage aircraft, located at a working airport.

A fascinating aviation museum where you can chat with the veterans who once flew the aircraft on display.

This enormous World War II relic is one of the largest wooden structures in the world.

Nevada's largest cactus collection stands outside a candy mogul's small factory.

The longest and widest floating bridge in the world.

These unusual rooms on wheels are holdovers from the 1960s.

An antique narrow gauge railway line still running through the Colorado and New Mexico mountains.

The awe-inspiring ship from the golden era of cruising has an incomparable history and a reputation as one of the world’s most haunted places.

Outposts of this restaurant chain were shaped like jaunty chapeaus.

South Korea's largely symbolic, barely used gateway to the North.

A massive hydrovolcanic explosion left a half-mile wide crater in Death Valley.

The space-age building is home to one of the few remaining rotating restaurants in America, and the only one that inspired a 1980s sitcom.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

This colonial tavern played host to George Washington, Thomas Jefferson, and other famous early Americans.

The narrowest house in America is seven feet of pure spite.

The Cold War-era "underground Pentagon" is a sprawling subterranean hideaway for the Defense Department.

An unfortunate geological resemblance to Satan has labeled this Pasadena gorge as a passage to the underworld.

Smooth basaltic rocks tell a tale of ancient glacial waterfalls.

Honoring the famed folktale author, this California museum looks like it belongs in the Black Forest.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.