This elegant arc of a waterfall marks a religious turning point.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

Romania's triumphal arch looks out over Bucharest.

The legendary cliffside castle of three-time Voivode of Wallachia, Vlad the Impaler.

This snug medieval lane is one of the narrowest streets in the world.

One of the great treasures of Neolithic art lies within this carefully constructed pile of rocks.

An all-American grocery store in Paris sells U.S. "cuisine" like Pop-Tarts and Heinz ketchup to homesick ex-pats.

A surrealist timepiece by the artist of melting clocks.

A 400-year-old church covered floor to ceiling in ex-voto offerings from the faithful.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

The center of the only hemisphere that awards visitors with a commemorative coin.

Hundreds of prehistoric stones, arranged in perfect lines in a French field.

A super-sized promotional trick that is now a D.C. landmark.

Giant acorn-shaped 19th century gazebo from which suburban Washingtonians gazed upon the original "silver" spring.

A former major munitions plant that has been converted into a sprawling art space.

This grand gothic brewery has been pumping out suds for over a hundred years.

This pun was simply waiting to come to life, and one defense contractor made it so.

The site of the climactic scene from the classic horror film is now a historic landmark.

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

At 207 feet, one of the world's longest continuous escalators.

Wisconsin's most celebrated export gets the royal treatment on I-94.

Robots, lasers, and whoopee cushions, oh my!

A trailblazing sovereign nation tucked in the American state of Wisconsin.

This striking art museum holds an amazing series of curiosity cabinets.