The first green space constructed on an elevated viaduct.

An extraordinary natural landscape of mountains, waterfalls, and rocky cliffs riddled with tunnels.

This home designed for chocolate magnate Antoni Amatller is an exquisite treasure-box of Catalan Modernism.

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

The official flag of the short-lived Republic of Formosa.

These tenacious 14th-century towers defied demolition and are now a fairytale vacation rental.

Take a walk in a recreation of ancient Rome.

St. Peter’s, in Western Germany, has stood as a masterpiece of Romanesque architecture since 1181.

Lines on the pillar of Heidelberg's Karl-Theodor Bridge record the dramatic heights of past floods.

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.

This historic funicular system combines the old with the new while offering delightful views over the surrounding valley.

It's good luck to be mocked by this monkey.

In this German city center, the streets have no names.

The oldest floral clock in the world still functions today.

This extinct volcano rises above Edinburgh and is special for its panoramic views over the city.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Erotic art covers the walls of the largest ancient pleasure palace.

The walls and streets of the ancient city are peppered with penises.

Ancient snack bar of the Roman Empire re-opened.

Before it was buried by volcanic ash, this fast-food restaurant fed the hungry hordes of ancient Rome.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

San Gennaro, the patron saint of Naples, greets pedestrians between these narrow city streets.

This medieval city gate is now a blend of the past and the modern world.

Check the time in 145 countries at once with this East German relic.