Some 80,000 Delft Blue tiles line the inside of this Amsterdam walkway.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

Colorful and chaotic stacked hotel in North Holland.

The tallest church in Mechelen might have been the tallest in the world if not for a lack of funds.

One English town's celebratory landmark spurred more trouble than anticipated.

The beloved beast's taxidermy remains sit in the Natural History Museum's cafe.

Repository for more than 22 million pickled specimens.

Eighty million natural history specimens call this gargantuan museum home.

This marine reptile was discovered by one of the 19th century's greatest fossil hunters.

An architectural oddity hides in plain sight on this iconic London bridge.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

The commemorative stone column conceals a secret laboratory.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

A hands-off space for graffiti artists to hone and display their skills.

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

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

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

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

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