This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

The largest outdoor art gallery in the Northwest United States.

An earthwork sculpture built by Robert Smithson in the Great Salt Lake only reemerges during drought.

These falls, sometimes called the "Niagara of the West," still put on a good show at the right time of year.

Just a man taking his prehistoric pet for a stroll.

Native Americans built this circle of stones, which was used to predict astronomical events.

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

This staircase in a lush tropical grotto was built by enslaved laborers and renamed to honor Queen Victoria's role in ending slavery in the British Empire.

Nestled within a German forest is an intriguing, growing rock.

A stairway to heaven, or to nowhere at all.

A fearsome dragon clings to a corner of Munich's city hall.

Golden cobblestones remember a time when this small alley was used to avoid having to give a Nazi salute.

A giant snail sculpture looking longingly at the German traffic museum.

Caves famous for the dragon-slaying saint who lived there.

At this coffee shop, each drink celebrates African-American history and luminaries.

Outsider art meets paleontology at this roadside reptile repository.

Secret gardens just a few miles from downtown Atlanta.

This angular brutalist playground turns playtime into modern art time.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

Ancient snack bar of the Roman Empire re-opened.

The yawning maw of this pagan visage is said to bite off the hands of liars.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

They call this long foot bridge a swinging bridge, but really it's the bouncing you have to watch out for.