A curious friendship between two inanimate ladies.

A drawbridge named for a potentially intersex Polish national who fought alongside George Washington during the American Revolution, and an example of "Pulaski Red".

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

A crumbling hospital from the 1850s on Roosevelt Island.

Tucked away amidst some of the most famous addresses in the world is New York's only fraction of a street.

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

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

A graffiti Mecca welcoming artists from around the world.

A dilapidated dock tells the story of Titanic's missed arrival.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

Fine dining in the bizarre world of Lewis Carroll.

If Hello Kitty were Mickey Mouse, this would be Disneyland.

Catacombs turned marketplace.

A cluttered and astounding collection of antiquities and curiosities.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

Unsurprisingly, Holland is home to one of the most magnificent flower gardens in the world.

A faithful reproduction of Al-Jazari's enormous water clock.

An underwater restaurant, surrounded by a coral reef.