A self-built castle made by a mysterious man.

Century-old shop, specializing in Occult products.

Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

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

The second oldest continuously operating bar in Louisiana.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

One part local history, 99 parts gruesome haunted house.

A museum dedicated to exhibiting remarkable outsider art.

Bizarre lunar-like landscape with thousands of large stone "hoodoos."

The trials and tribulations of marking Poe’s grave.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

A museum dedicated to the alleged Roswell Incident.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

A semi-scholarly approach to sex.

A look into the Church of Scientology's deeply unfavorable view of psychiatry.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

Home to items never before seen by the public.

A reproduction of earth's many biomes.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

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

The magic's in the hole!

The world's longest known cave system.

The largest earthwork effigy in the world.