An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

Rent out a glass igloo to watch the Northern Lights like you live in the future.

The Boston square dedicated to the dark poet who was born nearby.

Sitting on an Italian hilltop is this surreal fortress built by the mad inventor of electrohomeopathy.

The 953 windows undoubtedly make this the world's most beautiful screened porch.

A collection of Witchcraft artifacts and occult paraphernalia started by the leader of the Long Island Coven.

Nine Gardens in one—with tea service.

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

2300-year-old Roman road connecting the empire.

400-year-old garden, restored to beauty.

This Big Sur waterfall drops 80 feet directly into the Pacific Ocean, and inspired the hillside house up top.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

The quintessential Japanese rock garden has existed for more than 500 years.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

This Buddhist temple is home to the graves of the Japanese national legends, the 47 Ronin.

The hallucinogenic center of the ancient world.

Keshwa chaca, among the last handwoven Incan bridges, crosses Apurimac Canyon in Peru.

Historic funicular railway, believed to be the shortest railroad in the world.

Japanese national treasure originally built in 593 CE.

1,001 carved statues of the Buddhist God of Mercy, each with a unique face.

The underground sanctuary of a mysterious ancient cult.

A surrealist timepiece by the artist of melting clocks.

If drivers cross the rumble strip on this stretch of Route 66 at just the right speed it plays "America the Beautiful."

A battle between nature and architecture in the Cambodian jungle.