This coffee shop lies hidden beneath a historic church.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.

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

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

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

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

Wonderland replication in progress by one persistent man.

A historic building houses one of the most important archaeological institutes in Europe.

An immersive projection art installation uses sound, scale, and light to take visitors inside classic works of art.

The first green space constructed on an elevated viaduct.

Known as the "Dodo Manège," this carousel features a herd of animals that have disappeared—or may be gone soon.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

A Bronze age settlement on the Greek island of Santorini might have been the inspiration for Plato's Atlantis.

A quirky bookstore hidden beneath a sea of whitewashed Greek villas.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

A sharp sculpture made of thousands of pieces of jagged glass.

The ruins of an abandoned medieval city where the last Byzantine emperor was crowned.

This remarkable cave was discovered after a shepherd watched bees enter and exit through a small fissure.

This contemplative sculpture made out of old machine parts is meant to be the first in a series of sculptures around the world.

Dozens of musicians have planted trees in this Danish park, and donated songs to go with them.