This subterranean necropolis holds three floors of antler-dug grave caves.

The world's most active stratovolcano is almost always erupting.

Italian cave with exceptional acoustics and an unsavory history.

Dynastic Home of the De Piro Family.

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

The world's largest man-made underground caverns offer unparalleled underwater wonders.

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

Museum preserving torture methods from the past.

World's largest collection of serial killer artwork and other macabre exhibits.

World-famous, Pink's still manages to keep its prized cult fetish status.

Medical and zoological curiosities for sale.

Storybook cottage in Beverly Hills was once the site of 1920s silent film studio, affectionately known as "The Witch's House."