The Devil’s own choice when he needs a drink in Brussels.

A preserved portion of an ancient Athens barrier is displayed in a hotel basement.

The remains of this 2nd-century Roman temple are incorporated into a modern building.

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

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

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

One of several skulls claiming to belong to the beheaded St. John the Baptist is on display at this Roman church.

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

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

In one of the world's smallest countries, a royal's personal winery is open to the public.

Featuring a meatless buffet fit for kings, this family-owned Zurich eatery is considered the oldest vegetarian restaurant in the West.

These waste baskets play a few risque messages to discourage littering.

This 16th-century house tells the city's history through old artifacts and quirky tales.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

You may get stranded and everyone's peeing in the water, but at least there's cocktails!

A small collection of iguana-infested ruins hides amid Cancún's bustling hotel zone.

Its columns were all carved from the same white oak tree.

The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

One hundred years ago this small house in downtown Zürich became the birthplace of the Dada movement.

Copenhagen's celebrated theme park and gardens.

This demon atop the Notre-Dame de Paris looks utterly bored.

The castle still holds traces of the abandoned Roman fort it was built atop.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

This ancient market is often referred to as the oldest shopping mall in the world.