This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

One of only two commuter aerial tramways in the United States.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

This little museum is built on a theater that was once a wildly elaborate speakeasy.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

A sweet symbol marks the place where torturous executions were once carried out.

A millionaire's abandoned swimming pool from the gilded age of one of America's most distinguished families.

An eccentric playboy's astounding natural history collection.

Beneath the mossy overgrowth covering this once-sprawling campus lies decades of history and the secrets that come with it.

A historic presidential getaway on the continental United States' southernmost island.

A monument celebrating the idea of reaching inaccessible places.

A former poultry store that looks like a giant duck and is one of the "seven wonders" of Long Island.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A tiny islet just off Long Island offers a wealth of infectious curiosities.

A six-ton wedding present for the King of the Scots.

The final resting place of soldiers' loyal canine companions.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

This luxury shopping lane has been protected by its own tiny police force for over a century.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

Traveling collection of amazing automata.

Giant, friendly pelicans in Central London, the most unlikely of places.