Visitors can walk over the largest concentration of Columbian mammoths to have died from one event.

This titanic oil company sign is a reminder of the Americana boom of the 1970s and also its commoditization.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

Giant WWII fortresses that fired 8,000 rounds a minute, now home to thousands of pigeons.

Soaring over 6,000 feet in the Bavarian Alps, this beer garden was once Hitler's 50th birthday present.

A fascinating insight into daily life in the Eastern Bloc.

The final resting place for the remains of 143 Habsburg royalty.

Go surfing on this urban wave, "hacked" by local surfers.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

A number of craters left by fatal mortar strikes have been filled with red resin to remember those lost during the Siege of Sarajevo.

This historic timepiece is thought to be the only public clock in the world that keeps lunar time.

Oriental bazaar in the heart of Sarajevo.

Inat Kuća, or "House of Spite," is more than just an oddly named restaurant.

The place where World War I began.

The only presidential monument to display a late POTUS's actual casket.

The world's longest known cave system.

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

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

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

Featuring one of the most complete and original collections of Presidential memorabilia, this is the site of the last front porch presidential campaigns.

This presidential tomb was not dedicated until years after Harding's death due to personal controversy.

A gas station has taken the place of the home of the 19th American President.

A celebrity from the late Cretaceous period.

The oldest continuously operating fish market in the United States.