Every day is like Christmas on this street where the traditional Neapolitan nativity scene comes to life.

A mysterious shape catches the eye in this 16th-century painting.

The medieval woodcut-style artwork chronicles life in medieval London.

This nondescript building hides an entrance to an underground nuclear tunnel system.

A striking memorial recalls thousands of Bolognese men and women killed fighting fascists in World War II.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

The oldest giants in Catalonia are now displayed in a 14th-century Gothic church.

This cafe offers a curated collection of treats and tipples made by monks and nuns.

A temple to modernity, tucked away amid Barcelona's more well known museums.

Barça football fans might see the insignia hidden in a church window as a divine sign.

Possibly the oldest church in Barcelona, this basilica has its pagan and Christian mythologies all mixed up.

Saint Joseph was said to heal the deaf and blind, but it was a much smaller miracle that got him canonized.

An eclectic collection of thousands of items owned by the sculptor Frederic Marès.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

Turntable anonymously received orphans, alms, and groceries.

The broken skateboards that became a poignant memorial to a murdered skater.

Public access to clean drinking water was an instant hit among the masses.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

The fierce beast perches atop a pedestal marking where the historic City of London gates once stood.

William Smith's iconic "map that changed the world" is hidden behind a curtain in the Geological Society building.

Repository for more than 22 million pickled specimens.

The bones of two medieval royal lions were discovered at the historic fortress.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

A plaque marks the humble origins of an artistic muse who embodied the ideals of Pre-Raphaelite beauty.