The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

This pair of gilded girls atop an Art Deco building in Copenhagen were built to function as a weather indicator.

The world's first combination ski slope and power plant.

This bridge's unique architecture honors nautical heritage and encourages self-awareness.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Copenhagen's celebrated theme park and gardens.

What was once believed to be a church floor turned out to be the artwork of geology.

These dramatic cola-colored falls have appeared in a poem by Henry Wadsworth Longfellow and a song by Sufjan Stevens.

A mechanical clock built in 1914, with a rotation of 12 historical figures on its face.

This steep-walled ravine contains animal-shaped formations made from sandstone.

The former home of the 11th president of the United States.

The National Park Service’s best-kept secret with views that rival any in D.C.

A 30-mile-long glacially-carved canyon leads to a massive pair of glaciers.

Beneath the southern end of the Golden Gate Bridge is the “Gibraltar of the West Coast,” a fort built to protect the San Francisco Bay from naval attack.

The walls of the statehouse tell the story of Ohio’s prehistoric past.

A small town museum celebrates the history of the Ohio county that produced Annie Oakley and other famous figures.

You can walk through the first Boeing Air Force One, which famously carried JFK's casket from Dallas back to D.C.

This unassuming home was once “grand central station” for the Underground Railroad.

Once designed as the entrance to Buckingham Palace, this structure was later relocated and stands as a victory arch.

The location where the American Revolution ended.

An art deco ice cream shop covered in vintage train station tiles.

These cabins mark the site where our 11th president was born (probably).

The former home of the man whose radical ideas changed the nation.