These ancient sunken lanes were naturally tunneled into the soft ground by countless footsteps.

A naturally mummified 2,000-year-old man.

Museum about life, death, and cannibalism in the Stone Age.

A closed London rail station created to cart away the dead still bears the marks of attempts to make it less morbid.

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

A mysterious artist-run cabinet of curiosities and library.

A makeshift shrine to the late rock star is still kept up on the nondescript façade outside 1 Logan Place.

London's smallest police station is barely the size of a phone booth.

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

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

This tangled English forest looks like something right out of a fairytale.

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

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

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

A special shop catering to the needs of things that go bump in the night, and also helps kids become writers.

A student driver's nightmare.

One part local history, 99 parts gruesome haunted house.

A vast overgrown cemetery, once known as one of London's "Magnificent Seven."

The curios of pharmacist and collector Henry Wellcome.

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

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

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

A tongue-in-cheek arcade where the games are based on everyday life.