Enormous lake at the bottom of a unique cave system.

Made of giant chains and hung with shackles, this iron cross honors those unknowns who perished under American slavery.

A museum and shop on Bourbon Street located in the former home of the second Voodoo Queen of New Orleans.

This park contains one of the largest concentrations of cedar glades, a unique and rare ecosystem.

This World War II bunker now survives as a documentation of the Nazi regime and war crimes.

Tiny memorials honor individual victims of the Holocaust.

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

Named after a militant urban guerilla, this famous former squat is a graffiti-covered stronghold of leftist culture.

A unique Holocaust memorial tells the personal stories of the Jewish residents exiled from greater Berlin.

A 12th-century fortress containing some of Berlin's oldest buildings.

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

From toys to kettles to scientific instruments, this German museum celebrates the beauty of 20th century design.

Home to 10,000 medical specimens including the remains of Rudolf Virchow's extensive collection of pathological specimens.

A wunderkammer of mysterious objects and stories.

A fascinating insight into daily life in the Eastern Bloc.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

Now a hotel, this former bank was the site of a robbery that spawned a psychological phenomenon.

Only spot in the world where an HVDC powerline, a single phase AC and a three phase AC powerline all meet.