What remains of the summer palace of King Kamehameha III.

This museum of Hawaiian and Polynesian culture is the legacy of the last descendant of the Kamehameha Dynasty.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

A geological mystery on Camelback Mountain.

A reproduction of earth's many biomes.

A self-built castle made by a mysterious man.

Two massive rock outcroppings on the Oregon coastline.

The lush coastal city of Astoria is riddled with forgotten secret sidewalks.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

When the big city meets the edge of the frontier, log skyscrapers are born.

Home to a full cast of the largest woolly mammoth ever recovered in North America. 

This decommissioned DC-3 now forever points into the oncoming wind.

Every fall this lake mysteriously drains, like a bathtub with the plug pulled out.

Few other hotels can rival the grandeur of the Castle in the Rockies.

Montreal's colorful subway station shows its support of the local LGBT+ community.

A wall of chewing gum moonlights as collective art.

A huge musical sculpture and other art installations on the National Oceanic and Atmospheric Administration grounds.

A museum dedicated to the history and exploration of both popular music and science fiction.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

The spiral staircase hidden inside this giant Parisian column was likely built for Catherine de Medici's astrologer.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

The oldest stone house in Paris was built by its most famous alchemist.

On the Oregon coast is a natural hole that seems to be draining the sea.