Architecture

A 10 million-ton rock once worshiped by the Tahamies Indians, accessed by an astounding staircase.

An eccentric inventor's castle home with its own indoor weather system.

A castle from the Holy Roman Empire that hosts traveling youth... in its stables.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

Known as the most dangerous bridge in the world, the Hussaini Hanging Bridge is only one of many precarious rope bridges in Northern Pakistan.

Climb inside an iron crystal magnified 165 billion times its normal size.

An electrical pylon under whose legs a normal gauge train can run.

The Bristol Camera Obscura housed in an ancient windmill.

A Gothic cathedral created from volcanic rocks.

A thin pane of glass keeps visitors from sliding off this futuristic skywalk.

A Turkish monastery tucked into a cliff wall.

Enormous pendulum helps keep Taiwan's tallest building from swaying.

Micro-nation based around a nine-story high illegally built tower.

Dr. Farid Mattar's Monument of Peace.

A Prada store in the West Texas desert that is never open for business.

19th century tunnels burrowed under Liverpool.

An ancient monastery, a locked room, and a mysterious book heist.

Modern Japanese museum is buried by snow annually.