A museum dedicated to exhibiting remarkable outsider art.

World's first "penitentiary," meant to be humane, drove men insane.

Century-old shop, specializing in Occult products.

A layered tribute to the work of mosaicist Isaiah Zagar.

Tubing through a cave lit with glowworms is a magical underground experience.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.