Lithuania's outdoor sculpture trail of wooden folk art.

This hulking behemoth is actually five interconnected towers built in the 1960s.

An enormous, inside-out glass globe built in 1935.

Hidden beneath the streets of London is a secret subway that only carried mail.

An underground city of salt.

Poland's oldest salt mine has nearly everything one needs to live underground forever.

A 70-foot-deep ice cave formed by lava from Mt. Fuji on the edge of Japan's "Suicide Forest." 

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

A harem-inspired Moorish fantasy design in a Victorian-era Welsh castle.

The oldest continual pilgrimage site in Britain was supposedly created by a gruesome beheading.

This stately estate house features a tower covered in a bright, modern mural.

Numberless clock creates a meal of time for the dreaded, insectile Chronophage.

A rocky sea serpent hides caves, blowholes, and a spectacular natural bridge.

Fantastically decorated underground chambers built in the 1760s.

The stately remains of Llywelyn the Great's mighty fortress.

A subterranean playground in an abandoned slate mine.

400-year-old garden, restored to beauty.

This foolish Victorian sea fort was converted to a deluxe hotel.

A student driver's nightmare.

This hospital once pioneered the use of electroencephalograms, but fell into maltreatment, abuse, and eventual abandonment.

A 18th century graveyard and its astonishing cortege of macabre iconography.

A historic London cemetery now serves as a nature park incorporating gravestones & memorial statues.

A metal tree emits eerie, melodic notes on top of Lancashire's Crown Point.

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