On the side of Christchurch Mansion is an enigmatic block of dark limestone that dates back to 14th-century Belgium.

Venture into the past with an unlisted exhibit hall featuring extinct birds.

This palace was built for the last king of Myanmar.

This magenta statue commemorates the legendary marriage between a mermaid and the city's founder.

A grumpy old water goblin guarding an old mill on the Devil’s Stream in Prague.

A salty red wasteland in Tanzania is a breeding spot for endangered flamingos.

This bizarre residential building is the masterpiece of Von Jour Caux, the “Gaudí of Japan.”

Nature took her revenge on the "Wickedest City in the World."

Sparkling, calcite-covered skeletons of children who may have been sacrificed to appease an angry god.

Roman ruins top white travertine terraces formed by ancient hot springs.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

Abandoned city hidden from the world by tropical forest and isolation on the coast of Kenya.

An architect transformed this abandoned cement factory into his castle-like workshop.

Mysterious Spanish catacombs of unknown origins.

One of the world's steepest streets seems to have houses sliding down it.

The unique building practices of the Batammariba reflect the community's deep reverence for and connection to the earth.

What was once believed to be a church floor turned out to be the artwork of geology.

This Quebec estate is home to the elaborate gardens of a self-taught horticulturist.

This railroad track was so secretive that it was omitted from all maps.

Outside of one of Britain's most renowned social clubs, a step installed specifically for the Duke.

Built to transport German U-boats through the never-completed Masurian Canal, the locks near this Polish village are now home to a rope course.

A former Canadian Pacific Railway station turned liquor store, the first and only station in Canada visited by British royalty.

A performance hall at the American Jewish University moonlights as a sci-fi film location set.

The eccentric mansion of one of the most popular horror authors of modern times.