This beloved Baltimore spot features caged dolls, a giant Pez collection, and many, many mannequins.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

The beautiful tunnel that ran from the lobby to Penn Station is still hidden underneath 34th Street.

12,000 sq. ft. museum tracing erotic art from antiquity to modern times.

A 200-year-old building in the French Quarter that was to be Napoleon's home in the New World.

A sculptor's dream castle turned fantastical ruin.

Most famous work of one of Frank Lloyd Wright's sons.

Nikola Tesla's former home contains an homage hidden from plain sight.

Enjoy an overnight at an old haunted B&B site of the Borden family murders.

A morbid secret lies hidden within the beautiful walls of the Boston Athenaeum.

A century-old hotspot for jazz, frequented by everyone from Charlie Chaplin to Al Capone.

Nondescript elevator doors open to reveal a stunning, surreal world.

This free, take-a-book shop seems like a trick but isn't.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

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

Just your average Marie Antoinette–themed speakeasy in an abandoned 19th-century subway tunnel.

A little piece of the Shire is hidden behind a plant nursery in Port Orchard, Washington.

Featuring a casually threatening atmosphere along with dessert and coffee to die for.

A whimsical village of unique treehouses resides in a Washington forest.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

If drivers cross the rumble strip on this stretch of Route 66 at just the right speed it plays "America the Beautiful."

The only rotating bar in New Orleans has been slowly spinning since 1949.

A particularly disconcerting tribute to Irish martyrs.

The 19th-century pharmacy (now a used bookstore) was featured in James Joyce’s "Ulysses," and has changed very little to this day.