The largest land animal skull ever discovered.

This haunted hotel built on natural springs once served as a hospital for a quack doctor promising a cure for cancer.

One believer transformed a local curiosity into proof of Vikings on the Great Plains.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Scattered throughout London are ancient remnants of the city's former bounding wall.

This one has sailed five times as far as Sir Francis Drake's famous ship.