A very classy 1920s-era bar right in Grand Central Station.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

Just your average Marie Antoinette–themed speakeasy in an abandoned 19th-century subway tunnel.

After starting as a whimsical tourist attraction that eventually found its way to ruin, these renovated canals offer a lush and exotic locale on the Pacific Coast.

This historic "City of the Dead" lies prominently in the center of New Orleans' famous Garden District.

A Bibliophile's Dream.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

If drivers cross the rumble strip on this stretch of Route 66 at just the right speed it plays "America the Beautiful."

Sniff the Titan Arum's rotting flesh.

A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.

Make your reservation to have coffee with some kitties.

Florida might be at its most surreal in this museum devoted to the famed Spanish artist.

Ride the subways of yesteryear.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

This naturally-sourced hot spring is now home to a clothing-optional resort.

An underwater city for the dead.

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

Olfactory delights in San Francisco's Botanical Gardens.

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

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

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

Two thousand artifacts from around the world collected by one woman who loved to travel.

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