The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

A downtown park built on top of unclaimed graves.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

A striking public sculpture representing the period of martial law in Communist Poland.

This museum in the tower of the oldest church in Gdańsk, is home to centuries-old time-keeping devices and the world's first pulsar clock.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

Washington's iconic carousel has a nice piece of Civil Rights history.

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

This iconic science fiction house still looks like something from the future.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

Look closely and you’ll notice that the color changes a third of the way up the tower.

Be(w)ar(e) the moat around this historic Czech castle.

When ecosystems collide in the arid Southwest.

The childhood home of one of Ohio's favorite sons, pilot and war hero Eddie Rickenbacker.

Georges Seurat’s pointillist masterpiece has been recreated in Ohio in topiary form.

An impressive collection of over 50,000 minerals including moon rock from the Apollo 17 mission.

The final resting place of American icon Buffalo Bill, and a museum that aids in telling his tale.

Once a mortuary that held the remains of Buffalo Bill, this Denver hotspot is now a death-fixated restaurant.

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

Lyon, France is home to two remarkably preserved Roman theaters, one dating back to 15 BCE.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”