The legacy of a wealthy executive and his wife, this little-known art museum features works by Picasso, Monet, Renoir, Cezanne, and more.

These abandoned waterworks are crumbling into the Potomac River.

A rotating cast of guys and dolls in front of a Washington, D.C. building.

Beneath unsuspecting visitors feet, a capsule containing pieces of America’s civil rights history.

Also known as the Founding Church of Scientology.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

Depending on who you ask, this controversial treehouse is either a charmingly creative child's playhouse or an illegal encroachment on public land.

This groundbreaking 16th-century map is known as "America's birth certificate."

A centuries-old olive tree thrives in a small botanical garden.

During Prohibition, the U.S. Congress had an "official" bootlegger, with his own Capitol Hill office.

A fascinating insight into daily life in the Eastern Bloc.

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

In the summer of 1957, a massive architectural exhibition showed off the future of urban living in this German neighborhood.

Superb sweets await at the first Jewish bakery inducted into Berlin’s prestigious baker’s guild.

For more than 170 years, this family-run bakery has been serving Berlin’s best Baumkuchen, or “tree cake.”

This platform is now a memorial dedicated to those who were deported during the Holocaust.

This watchtower once presided over the Berlin Wall.

Art installations, derelict railcars, and endangered grasshoppers all call this south Berlin park home.

Taste freshly foraged yarrow and black locust blossoms at this ambitious cocktail bar.

This sprawling Jewish cemetery is one of the largest in Europe.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

Germany's Glienicke Bridge has a shady history of clandestine meetings, espionage, and spycraft.

One of the world's heaviest musical instruments towers within a popular urban park.

A brush maker used his factory to protect blind Jews from the Gestapo.