Go inside to really appreciate this 500-year-old technological masterpiece.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

A stunning cemetery famous for its extraordinarily delicate & lifelike mourning sculptures.

The astonishing collection of an infamous criminologist.

A fake medieval village in the middle of Turin.

This giant middle finger statue sends an unambiguous message to Italy's bankers.

One of a series of no-purpose kinetic artworks by Swiss sculptor Jean Tinguely.

Golden cobblestones remember a time when this small alley was used to avoid having to give a Nazi salute.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

Every hour on the hour a naked heroine and her leering foil appear from this giant cuckoo clock.

This historic club for wayward boys has shaped some of the biggest names in music almost as much as they have shaped it.

A Victorian Gothic masterpiece housing a world-class collection of rare books and manuscripts.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

This half-finished "city of toys" was almost Italy's own Las Vegas.

Eighty million natural history specimens call this gargantuan museum home.

This one has sailed five times as far as Sir Francis Drake's famous ship.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

The rotting skeleton of a shoreside fun fair that was destroyed by fire and storms still haunts the Brighton ocean view.

Regency-era excess on the English Coast.

Decrepit Victorian public lift is a white-knuckle ride.

The quaint little store that is said to have inspired a famous Dickens novel was only given its name after the book was released.

The anatomical-pathological collection of a man who changed surgery.