Eighty million natural history specimens call this gargantuan museum home.

Rebuilt remains of a temple to Roman god Mithras.

An unusual round church in London with a Templar past.

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

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

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

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the first ‘Harry Potter’ film.

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

An incredibly well-preserved piece of ninth-century Viking poop.

The little-known second castle that William the Conqueror built in York.

The National Railway Museum in York is the largest railway museum in the world, attracting almost 1 million visitors per year.

This disused Cold War bunker has been restored to all of its early 60s glory.

This network of narrow, medieval passages has the most delightful name.

A century-old tradition has culminated in a small but singular collection of feline effigies.

Thousands of well-dressed mummies below a monastery.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

The Pope’s secret escape route.

A Nesting Doll of Churches.

The final resting place of the poets Shelley and Keats.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

Europe’s oldest natural human mummy.