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

A slice of central Asia in the middle of Berlin.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

A submerged archeological park still holds the wonders of a Roman Sodom.

The inspiration for H.P. Lovecraft's horror stories and Batman's Arkham Asylum is now a condominium complex.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

The atmospheric road was never meant to be so creepy.

A beautiful 62-acre Catholic shrine and botanical garden.

Get lost in this haunting fairytale art walk through a man-made eucalyptus grove.

Banksy gives themself artistic license with this piece of London street art.

A museum of carnival attractions where you are invited to ride the rides.

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

Started as a kitchen garden, now the second largest botanical garden in the world.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

The site of the climactic scene from the classic horror film is now a historic landmark.

Macabre astrological automaton clock dating to the late 1400s.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

This morbid, delightful curiosity shop offers everything from animal bones to human teeth.

This shop for all your super spy needs hides an educational secret.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.