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

A must for film lovers in Madrid and home to the Spanish Film Library's projection space.

Of the many chalices in the running for the Holy Grail, this one in Valencia Cathedral sure looks the part.

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

A curious fountain that resembles a beloved character from the 1960s.

Bacteria and algae give the salty water its bubblegum hue.

If you like Art Deco you will love this bridge.

This local cultural center is housed in one of the most important Valencian Art Nouveau buildings in a town that is blessed with many.

A celebration of solstice followed by a fiery purging of evils.

This magnificent market stands as a poignant symbol of the suffering caused by the Spanish Civil War.

This seaside Italian village doesn't just look Escher-esque, it actually inspired the mind-bending artist.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

Drink wine handed out through a window as part of an age-old tradition.

A medieval weapon rumored to have been used by the brilliant poet himself.

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.

Secret refuge and museum of the Duke of Florence.

This abandoned Brutalist treehouse is a hidden architectural relic.

This equestrian statue of Constantine the Great has been the subject of criticism for centuries.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

This large, circular tomb is the final resting place of the first emperor of Rome.

A monumental fountain in Rome features a large statue of Moses that has been criticized for centuries.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

A forgotten "city of water" underneath the famous Trevi district.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.