Eighty million natural history specimens call this gargantuan museum home.

Catacombs turned marketplace.

Hear the quietest sound from across the dome.

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

One part local history, 99 parts gruesome haunted house.

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

Hidden beneath the streets of London is a secret subway that only carried mail.

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

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

The largest of only eight working transporter bridges left in the world.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

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

Fascinating town where normal life interfaces with the occult.

The unusual clock on this 18th-century market building has an extra minute hand for "Bristol time."

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

This Roman amphitheater is said to be King Arthur's legendary Round Table.

Go deep down into the earth to experience the world of Welsh coal miners.

High Victorian fantasy created a fairytale castle out of a ruined fortress in Wales.

The enormous earthwork sculpture honors the ponies that lived and worked in the old colliery.

Banksy's image of a naked man dangling from the window of a sex health clinic.

An impromptu shrine appeared shortly after beloved "Torchwood" character Ianto Jones was killed off the show.

Recently restored menagerie of Victorian-era beasts.