These millipedes glow not out of attraction, but as a not-too-subtle warning.

The longest hedge maze in the world.

Oh, just a motel on the edge of the desert decorated with thousands of clowns conveniently located next to an abandoned graveyard.

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

Museum preserving torture methods from the past.

An Australian lake whose pink hue defies scientific explanation.

Stunning wetlands ablaze with pink lotus flowers.

A crumbling hospital from the 1850s on Roosevelt Island.

On the Oregon coast there is a natural hole that seems to be draining the sea.

A massive underwater sinkhole made famous by Jacques Cousteau.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

Eighty million natural history specimens call this gargantuan museum home.

A genuine Little Shop of Horrors.

This tangled English forest looks like something right out of a fairytale.

Fascinating town where normal life interfaces with the occult.

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

A subterranean playground in an abandoned slate mine.

This castle was established by the 4th Duke of Montrose and is connected to the Buchanan Clan.

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

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

The decaying ruins of Wales' first asylum for the mentally ill.

The oldest licensed distillery in Ireland.

This collection of historic puppets honors centuries of the craft.

Legend says this cave housed a 16th-century cannibal and his family of 48.