Enjoy a slice while browsing the world's largest collection of pizza memorabilia.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

Step inside Lucy, the world's largest "elephant."

See massive fossils that are over 200 million years old in northeastern Arizona.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

A museum dedicated to the alleged Roswell Incident.

Museum preserving torture methods from the past.

The celebrated eyesore created by starry-eyed sweethearts.

A favorite Paris bar for U.S. expats, including Gershwin, Hemingway, and James Bond.

This mysterious marker puzzles pedestrians and infuriates geographers.

Final resting place for the Triangle Shirtwaist fire’s unidentified victims.

Touching mementoes from those who didn't make it back from World War I still hang in one of New York's oldest bars.

A Victorian cemetery in the heart of Brooklyn remains a popular mecca of morbid curiosity.

This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.

Sniff the Titan Arum's rotting flesh.

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

Try not to get slimed in Tribeca.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

Come for the Italian food, stay for the taxidermy and giant statues.

The rusting remains are visible sticking out of the waters of the Delaware Bay.

World War II bunker still standing on the New Jersey beach.

Elvis's own personal tropical hideaway.

A monument celebrating the idea of reaching inaccessible places.

A Texas cave network is home to some of the world's most spectacular-looking and bizarrely named mineral formations.