This super steep hike ascends 2,000 feet in less than a mile.

The highest bridge in America was built for an almost unnervingly small amount of money.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

The largest self-built castle in the U.S., six decades in the making.

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

A DIY art gallery/music venue/lecture hall dedicated to video game culture.

This lower Manhattan bar is set up in an old bank vault that rests beneath a skyscraper that hides even more historic splendor.

Elevated freight railway turned wildly successful urban park.

Statue dedicated to the star of an old television show.

A theme park attraction designed to turn your children into LARPers.

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

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

A blacklight journey through a celestial art exhibit.

This fast-food outlet is the only space and UFO-themed McDonalds in the world.

In rural Iowa, an imported 19th-century windmill overlooks an unlikely enclave of Danish culture.

A museum dedicated to the alleged Roswell Incident.

Dedicated to the art and science of glass in equal measure, this space is as much laboratory as museum.

Ghost stories surrounded this “castle,” the only structure from a huge mansion that was never built.