The only intersection in America where the buildings on all four corners were built pre-Revolutionary War.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

Nope, not Washington Irving's house.

Public access to clean drinking water was an instant hit among the masses.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

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

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

The barrel-made lookout from Shackleton's final ship is tucked away in the crypt of one of London's oldest churches.

Scattered throughout London are ancient remnants of the city's former bounding wall.

This natural rock "church" might not be a proper chapel but that doesn't mean it's not beautiful.

Scary metal statues adorn some of the signature buildings of Burlington, Vermont.

Once the tallest building in the world and the site of “the highest dinner ever held in New York” this building now holds the most expensive penthouse in the city.

North America’s largest collection of horological devices and home to a colossal clock with a dizzying array of features.

The oldest farmer's market in America is so ancient it was approved by the King of England.

The summer home and later final residence of acclaimed American sculptor Augustus Saint-Gaudens.

Avoid gangster interaction while window-shopping.

This ruined fort hidden at the top of Central Park can't seem to keep from losing its historical plaques.

The remains of the furnace and iron works that produced the massive Hudson River Chain still stand in the woods of New York.

Two thousand artifacts from around the world collected by one woman who loved to travel.

An enormous, inside-out glass globe built in 1935.

Spinning silently in the lobby of an Art Deco masterwork is a massive vintage model of the Earth.

Site of the first pathological and bacteriological research facility in the United States.

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