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

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

Crumbling remnants of what was once a booming town full of silver.

This evocatively named natural crevasse was created by a torrent of water that smashed right through a granite deposit.

The Burnside Fountain and its questionable interpretation.

This miniature feudal castle was built on a whim to honor a US Navy pioneer.

Frida Kahlo's childhood home, now a museum of her life and works.

Central America's deepest lake is actually a volcanic caldera, surrounded by three volcanoes.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

This tiny church near Sleepy Hollow contains Henri Matisse's last work, a rose window, and nine windows by Marc Chagall.

Man-made waterfall is the tallest in Mainland China.

Ancient serpentine sacrifice holder that has stood the test of time.

A marvel of Byzantine engineering under the streets of Istanbul.

The largest ice cave in the world is thought to be the entrance to hell according to Austrian legend.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Empty, but not abandoned, this cavernous Brooklyn loading dock was once considered the largest individual building in the world.

A decommissioned military complex that's now a modern industrial park.

Sniff the Titan Arum's rotting flesh.

Leaf through over 30,000 artists' sketchbooks in what may be the world's largest collection of doodles

Memorial of the Salem witchcraft hysteria in the town of Danvers, where it all began.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

An unconventional space for art and science housed in a massive old warehouse.

This chapel on a cliff is renowned for its healing powers and was founded on the site of a supposed divine intervention.

This small primate research island is teeming with playing, fighting wild monkeys.