2300-year-old Roman road connecting the empire.

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

360° views of the city plus five floors of optical illusions and hands-on science.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

This futuristic German television spire is actually the world's largest digital clock.

This peculiar museum offers hands-on interaction with seemingly intangible principles of mathematics.

Twisted buildings adorn the banks of the Rhine river.

This abandoned coliseum was intended to be a grand Nazi rallying ground before it was halted at the end of the war.

A former ironworks that was the first UNESCO industrial site.

Cold war icon and onetime "hole" in the iron curtain.

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

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

A Black Forest cuckoo clock theme park features one timepiece big enough to walk inside.

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

A restaurant and observation deck built in a unique broadcasting antenna.

The prototype for all Nazi concentration camps.

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

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".

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

Where once there was a train station bathroom, there is now this German burger joint.

A fascinating insight into daily life in the Eastern Bloc.