The southernmost point in the United States is a beautiful place to look at but a deadly place to wade in.

A model of a galactic embassy is hidden in plain sight along the highway, proposed by a UFO religion to find the aliens that created life on Earth.

In 2018, Pohoiki Road was severed by lava flowing from the eruption of Kilauea.

A Barbary Coast watering hole built into a Gold Rush shipwreck.

Visible below the waves are memorials to the city's Gold Rush dead.

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

A man-made island in scenic San Francisco Bay.

Known as the "Dodo Manège," this carousel features a herd of animals that have disappeared—or may be gone soon.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

This 15-story mural celebrates the 50th anniversary of the musician's iconic "At Folsom Prison" album.

This painted marvel is San Francisco's 400-foot ode to urban biking.

An eccentric home stands out in an otherwise average neighborhood with mosaics, mini topiaries, and kinetic sculpture.

A memorial to Chinese freedom in the city where American freedom was born.

The narrowest street in Paris.

The first green space constructed on an elevated viaduct.

A lone cannonball remains lodged in the walls of the Hotel de Sens as a sober reminder of a revolution.

A museum dedicated to one of Paris’s most famous residents, tucked into a corner of one of the city’s most famous squares.

A modern-day Lascaux cave underneath Paris.

This recessed garden protects thousands of mountain plants by creating its own microclimates.

The video game-themed street art first popped up in the French city.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

The celebrated eyesore created by starry-eyed sweethearts.

This bridge was constructed from the rubble of the infamous Bastille.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.