Renaissance hospital featuring a rotating door into which unwanted babies were dropped.

Massive galleon from a box-office bomb docked in Genoa.

This strange bovine gargoyle is said to have been put in as a passive aggressive form of revenge.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

Banksy gives themself artistic license with this piece of London street art.

A recently restored Shoreditch landmark with ties to Jack the Ripper.

A student driver's nightmare.

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

A quiet memorial to those who died saving others in the heart of the City of London.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

One of the figures in this Celtic sculpture continues to puzzle archaeologists.

This Viking gravestone carved in a rare runic style was dug up from a London churchyard.

It's a mystery why these remains were found with no traces of their bodies in sight.

The gigantic skull of a long-extinct species that once roamed the forests of England and Ireland.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

Installed at a chaotic intersection, this gave London traffic cops a place to hang their heavy woolen coats.

The Tudor-style cottage in the middle of the square is not quite what it seems.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

A whale rib was used to advertise the store by the arch that offered exotic goods from far away.

Pilgrimage site for star-crossed lovers.