Where hikers on the Tecumseh Trail can exchange a dirty sock for a free geode.

A gorgeous mural outside a beloved D.C. restaurant pays homage to famous Black Americans.

Fragments of architectural wonders from around the globe are embedded in the newspaper building's walls.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

A spectacular remnant of an Adler and Sullivan masterpiece that was destroyed in 1972.

This historic hotel invented the chocolate brownie.

More than 450 years ago, an Italian nun became the first woman to paint the iconic subject.

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

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

Tiny memorials honor individual victims of the Holocaust.

A monument to the man who almost killed Hitler.

The walls of Germany's Parliament still show the scars of the Red Army takeover in World War II.

Dedicated to the European Sinti and Roma peoples murdered during the Holocaust.

The site of a concentration camp where inmates were made to take part in one of the largest counterfeiting operations in history is now hauntingly empty.

These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

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.

A fearsome dragon clings to a corner of Munich's city hall.

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

A castle from the Holy Roman Empire that hosts traveling youth... in its stables.

Nestled on the banks of a river in Nuremberg is a small museum that was once home of the city's official executioner.

What appears to be an ordinary bridge is actually a rare aqueduct.

In this truly magical place, rent hasn't been raised since the year 1520.

Legend says this sculpture commemorates a brave baker who rescued the city in the Thirty Years' War.