This legendary city has been a tourist attraction for centuries.

Large collection from the 3rd millennium BCE.

Where commuters walk through remnants of an ancient Greek necropolis.

This gem is often wrongly overshadowed by the larger, newer Metropolis church in Athens.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

What once sat in the world’s spotlight is today a largely disused ghost complex.

The hallucinogenic center of the ancient world.

This Dresden church was purposely rebuilt Protestant after being demolished in World War II.

The largest treasure hoard in Europe is contained in a castle that was bombed out during World War II.

This incredible stone temple is a monument to death, victory, and fantasy architecture.

Retirement home for giant obsolete machines.

Explore the complex ecology of this multifaceted nature preserve by riverboat.

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.

Terrifying derelict military hospital once housed a recuperating Hitler.

The "Prussian Versailles" that is as glorious today as when it was built.

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

Started as a kitchen garden, now the second largest botanical garden in the world.

A tree-like building perches on its trunk in the Steglitz neighborhood of Berlin.

Metro station with a claim to rock n' roll fame.

Berlin's natural history museum houses the world's largest mounted dinosaur and the late beloved polar bear Knut.

Berlin's beloved bear is immortalized at the Museum für Naturkunde.

Berlin's old airport.

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