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

This pink watchtower served as the seat of the Greek government after independence from the Turks.

This 17th-century street hidden beneath Edinburgh was once a breeding ground for the black death.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

These Stolpersteine located in Spain honor Republican soldiers who perished at the hands of Nazis after the fall of France.

A contemporary art installation housed within a Gothic cathedral.