A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Alexander Hamilton’s creation caused quite a bit of controversy.

Yo, Adrian!

This small, ancient Roman temple was once a church dedicated to the patron saint of penitents.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

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

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

The "lovely red Vega" of the legendary record-settling pilot.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

Home to items never before seen by the public.

A 200-year-old bar in the historic French Quarter refuses to give up its place in history, nor its role in securing ours.

Amid skyscrapers and traffic exists this unique aquatic ecosystem.

The façade of this building looks like a bingo board, but it's really a giant clock by a famed graphic designer.

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

Beautiful scenery provides the backdrop for an abandoned coastguard facility.

400 million years of erosion shaped these fascinating seaside caves, which made an appearance on 'Game of Thrones.'

Try not to get slimed in Tribeca.

"We Seceded Where Others Failed."

The most confusing clock in New York.

You can still ride this 100-year-old work of art in Brooklyn's largest public park.

The pockmarks across the building's facade are remnants of the Blitz.

A domino effect created with Britain’s iconic telephone boxes.