This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

Once the grandest synagogue in medieval Spain, it now stands as a memorial of the 15th-century Jewish exile.

A display of torture devices used in the Spanish Inquisition and other scourges of medieval Europe.

The fragmented remains of a massive public bath connected to the city's water supply.

A lush indoor jungle fills this bustling Madrid transportation hub.

An ancient Egyptian temple in the middle of Madrid, Spain.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

Copenhagen's celebrated theme park and gardens.

An eerie, derelict amusement park in Berlin.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

This monumental work of art symbolizes the coming together of a previously divided city.

Berlin's old airport.

Blitzkrieg bop your way through Berlin's Ramones Museum.

Once a path for Jewish funeral processions, this unassuming alleyway is rich in local lore.

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

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.

A fascinating insight into daily life in the Eastern Bloc.

A memorial in the Tiergarten is a reminder of the suffering inflicted on homosexuals by the Nazi regime.

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.