Oregon's unexpected high desert, displaying layers of time in a colorful show.

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

An abandoned stretch of highway, deteriorating next to the operational one.

Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

One part local history, 99 parts gruesome haunted house.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

Thousands of well-dressed mummies below a monastery.

Architectureal fantasy quarter of Rome.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

One of only two commuter aerial tramways in the United States.

An homage to everyone's favorite prehistoric cartoon family.

The last of its kind in the country.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

The magic's in the hole!

Carved by a waterfall in a hard-to-reach rock formation, this heart-shaped rock has inspired romantics for decades.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

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

In the middle of an extremely unforgiving and desolate high desert is the most secret military facility in the world.