The longest continuous lava tube in Oregon.

A gorgeous mural outside a beloved D.C. restaurant pays homage to famous Black Americans.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

The oldest continuously-operating tavern in Wisconsin used a clever loophole to serve alcohol during Prohibition.

Dating back to the 1800s, two imposing buildings in Michigan have had countless transformations over the years.

This lone tree and dramatic sandstone outcropping are so beloved by Michiganders they can be found on one of the state’s coins.

A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.

The words of the neighborhood's most famous poets adorn four concrete walls.

A magical sinkhole on the Yucatán Peninsula is adorned with mini waterfalls and hanging vines.

This distinctive Crescent City tradition dates back to the days of horse-drawn carriages.

A beautiful 1920s tower filled with local hidden gems.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

When you're a great Russian Tsar, even your vomit gets a statue.

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

A lush indoor jungle fills this bustling Madrid transportation hub.

The walls and streets of the ancient city are peppered with penises.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

What began as an art installation is now the private drinkhaüs for a brewery's employees.

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

Huge masonic hall in Philadelphia with lavishly themed rooms.

World's first "penitentiary," meant to be humane, drove men insane.

An Irish Memorial commemorating those who perished due to potato blight.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

The taxidermied remains of Charles Dickens' pet raven, which helped inspire one of Edgar Allan Poe's most famous poems.