A gorgeous gilded tower houses what may be the world's largest collection of gin.

The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

People escaping slavery may have hidden inside a corpse vault.

Developed by focused shutterbugs, this museum exposes visitors to more than 6,000 different cameras.

Head underground and take a tour of the city's working sewer system, and see the underground river Senne, which defined Brussels for centuries before being covered in the 19th century.

A fantastical 13th-century fortification sandwiched by a modern hotel in central Brussels.

This modern arts center is built around a gem of late-Baroque architecture.

Cozy basement bar sports an inventory of over 2,000 beers.

This aluminum “stairway to heaven” has impaled at least a couple of birds.

This striking structure is the Socialist-modernist centerpiece of a former Soviet spa resort.

Neither Spanish settlers nor anyone since has been able to tell who built these strange California rock walls.

Once one of the largest rooms full of books in the world, this bookstore basement is still a treat for bibliophiles.

A remarkably well preserved tower dating all the way back to the Iron Age.

This popular cave pool is truly magical, despite the crowds.

This labyrinthine resting place of Black American leaders has been reclaimed by nature.

An ancient stone fortress considered by many to be the eighth wonder of the world.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

This unique bridge curls up like a caterpillar to let boats pass and then unfurls again to span a small canal.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

This grand gothic brewery has been pumping out suds for over a hundred years.

A diminutive memorial marks the site of a successful assassination by a right-wing death squad in America's capital.

Giftshop catering to cryptozoologists and anyone with a sense of humor.

A hidden passageway now marks the site of an assassination attempt on Ronald Reagan that some say broke a 140-year-old curse.

There's a crumbling old mansion inside the Smithsonian National Zoo.