The U.S. Supreme Court's secret Cold War relocation facility in the mountains of North Carolina.

Marine fossils from the Devonian period are exposed at this park.

The massive, original Colgate Clock is mounted on a defunct factory building that was once a prison.

A ceramic-tiled room at the Seelbach Hotel said to have secret tunnels used by Al Capone and a crowd that helped inspire F. Scott Fitzgerald's 'The Great Gatsby.'

The Midwestern United States' tribute to Michelangelo is a foam statue sprayed with gaudy gold paint.

The oldest operating Mississippi River–style steamboat still navigates the Ohio River.

This 19th century mansion façade adorned with immigrant patriotism is a symbol of Louisville’s history.

A full-scale replica of a 1774 colonial settlement in Kentucky.

This museum of miniature displays provides a journey through early American history.

A highway marker that honors a former spy plane pilot and local hero.

Explore this medieval cathedral by trying to spot all the malevolent monsters hiding in its beautifully colored windows.

Visitors dating back to the 1600s carved their marks in the stones of the iconic tower.

Danish whalers once brought back whale bones to use as building materials in places where wood was scarce.

A curiosity-seeker's paradise set inside a three-story historic school house.

The menus here are a love letter to the culinary history of New Orleans.

This huge clock made of flowers and simple machinery was once used a political weapon.

This modern castle sat empty for decades before a fire inspired its builders to complete its luxury halls.

Three courses accompanied by Christian rock.

This small condiment museum makes all manner of mustards with a 200-year-old mill.

The bones of the Biblical Magi traveled to Constantinople and Milan before landing in their current home inside an elaborate golden reliquary in the Cologne Cathedral.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

A top-secret bunker now turned museum, is an eerie look at what life would have looked like in the event of nuclear war.

A ruined castle stands atop a hill surrounded by dragon lore.

Thousands of flowers create enchanting pink tunnels over the city streets.