An ancient necropolis of magnificent tombs.

The largest caravanserai in Cyprus also includes amazing examples of Ottoman architecture.

This no man's land slicing through the island is strewn with abandoned relics of another time.

This triumphal arch celebrating the Sun King's conquest of Lille is a masterpiece of military architecture.

Egyptian Revival movie palace abandoned for decades and restored in 2013.

From cartoon characters to tiny tanks, a guerilla sculptor's little bronze statues are hidden throughout the city of Budapest.

A giant glider—designed by the father of the Rubik's Cube's designer—now soars within a shopping mall.

A two-way chairlift system between Zugliget and the highest point in the city.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

This platform is now a memorial dedicated to those who were deported during the Holocaust.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

Superb sweets await at the first Jewish bakery inducted into Berlin’s prestigious baker’s guild.