The gilded, masterful astronomical clock will calculate time, dates, and planetary positions for thousands of years to come.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

Opulence and fantasy collide in this royal chair which is supposedly made with unicorn horns.

This sublime architectural marvel is a rare example of an expressionist church.

An ultra-modern diversity park in Denmark has turned an entire city block electric pink.

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

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

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

From Iggy Pop to David Bowie to Nick Cave, this regal music studio has served some of the all time greats.

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

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

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

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

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

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

A fascinating insight into daily life in the Eastern Bloc.

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

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

On the wall of this medieval walkway, a symbol of the Spanish Inquisition.

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

This stunning iron gate designed by Modernist architect Antoni Gaudí is filled with mythic symbolism.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.