Each time a baby is born in Ghent, these streetlights flash in silent celebration.

An exclusive waiting room built for the royal family in the 1920s is hidden in Milan’s central station.

This curious building hides eclectic details like medieval gargoyles alongside naked angels and Art Nouveau mosaics.

The odd depiction of the Virgin Mary and baby Jesus is rooted in the Catholic Church's eradication of Catharism.

This Greek temple, open only an hour a day, was the site of a war of tastes between an architect and an artist.

The astonishing collection of an infamous criminologist.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

An incredible menagerie of more than 3 million taxidermied animals at the oldest science museum in Europe.

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

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

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.