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

Hidden out of public view in the National Library of Israel is a collection of "Stalag's," 1960s Nazi themed porno paperbacks written and consumed by Israelis.

Apartment complexes built into huge repurposed natural gas tanks.

Behemoth, cannon-like telescope operated by generations of Irish earls.

An eccentric playboy's astounding natural history collection.

Eclectic collections, artwork, and some feline friends fill the writer's former home.

This massive wooden building contains a giant Buddha, healing pillars, and tame deer wandering the grounds.

This giant seated Bhudda of Healing dates to the 1780s.

A museum commemorating the Donora Smog, which killed 20 people in October 1948 and sparked national outrage over air pollution.

Giant naked man on a hillside.

The blood-soaked ruins of the castle where the murderous Blood Countess was walled in alive.

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

A stunning cemetery famous for its extraordinarily delicate & lifelike mourning sculptures.

Crypt mausoleum in cathedral's basement contains relics of third century Roman martyr, Saint Vibiana.

One of Scotland's most important modern structures, it just made the '100 Most Endangered Sites' list.

The only tower of an aerial tramway standing over a ski-lift.

Spiral labyrinth hidden in the hills above Oakland, CA.

A classically inspired temple in Redwood City.

Possibly the most beautiful carillon in the world, set atop Iron Mountain in Florida.

Penn State's giant bug collection.

America's first public mental health facility.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.