A multi-storied adobe complex has been inhabited for more than a thousand years.

This narrow canyon has been carved by the river over thousands of years into spectacular and curious forms.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

Tiki luxury on Nob Hill.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

One part antique store, one part curiosities hodge-podge.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

A modernist landscape of water and sci-fi concrete.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Continuing the tradition of the dime museum in style.

A semi-scholarly approach to sex.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

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

Elevated freight railway turned wildly successful urban park.

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

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.