During the 19th-century, this park was a vital trading fort.

This modern antique shop is a museum for 1980's Saturday morning cartoon culture.

All that remains of this abandoned coal town is a beautiful, haunting cemetery.

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

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

This historic Jewish cemetery sits right in the heart of a Detroit car factory.

To truly appreciate Detroit's landmark skyscraper, you have to step inside.

A Beaux-Arts triumph set to become Ford's innovation campus

The deserted railroad town had a last gasp as a ghost town attraction before being abandoned for good.

This 19th-century church is now a popular roller rink.

A huge musical instrument played by the ocean.

Condemned US Navy seaplane control tower turned officers’ club sits atop Yerba Buena Island.

A hidden gem, named after a San Franciscan icon, offers spectacular views of the Pacific Ocean.

Overflowing with shipping containers, this location has been transformed into a massive workspace for artists.

The oldest dim sum restaurant in the United States is a nostalgic jewel.

San Francisco's oldest operating hotel, with a Victorian atmosphere and a "haunted" fourth floor.

The remains of a 12th-century chapter house in Golden Gate Park.

This partially buried wreck is one of the most complete of its kind but is only revealed when the sea allows.

An overlooked and unassuming engineering marvel.

This turn of the century masterpiece has a mysterious goaty interloper.