The oldest surviving synagogue in New York City is now a soaring art space.

Nikola Tesla's former home contains an homage hidden from plain sight.

Just your average Marie Antoinette–themed speakeasy in an abandoned 19th-century subway tunnel.

This interactive gallery makes you feel like you've stepped into a fantasy world filled with whimsical monsters.

One of the most enjoyable bits of history at Coney Island and “the most romantic ride in the world.”

The famous author's cottage hideaway.

The walls are decorated with whimsical murals painted by the creator of the Madeline franchise.

A celebration of capitalism in Midtown.

The world's first clock to use set theory as a measure of time required the invention of a new light bulb just to maintain its obtuse measurements.

A rather vulgar example of the transition from Latin to the Italian vernacular.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

A huge enchanting public park just outside the ancient walls of Rome.

This hill made entirely of ancient Roman jars was simply a garbage dump to the people of the time.

Architectureal fantasy quarter of Rome.

This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.

This unique architectural wonder is also tied to one of the 20th-century's most renowned writers.

This Ukraine alleyway has become its own little island of forgotten things.

Ukraine's oldest operating pharmacy now offers guests a fascinating walk through apothecary history.

Barça football fans might see the insignia hidden in a church window as a divine sign.

18th century anatomical amphitheater of the Royal College of Surgery of Barcelona.

The Polish capital has had a deep connection to its guardian mermaid for almost a millennium now.

Ruins of a late 1950s Polish ski jump ramp in the middle of the city.

This bell stars in a tragic love tale and is said to make wishes come true.

The world’s narrowest house makes for an awkward, four-foot-wide living space.