A cluttered and astounding collection of antiquities and curiosities.

A Victorian natural history and ethnographic museum with wonderful turn-of-the-century, science-book-esque evolution displays.

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

This 1920s Dutch barge is now a floating bookstore.

An Oxford museum where visitors can have tea with the Mad Hatter and climb through the wardrobe to a fantasy land.

The final resting place to 300 Victorian-era pets hides inside the city park.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

Hear the quietest sound from across the dome.

Catacombs turned marketplace.

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

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

Rebuilt remains of a temple to Roman god Mithras.

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

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

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

Eighty million natural history specimens call this gargantuan museum home.

One part local history, 99 parts gruesome haunted house.

An unusual round church in London with a Templar past.

Northern Ireland's Brobdingnagian stepping stones.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

The atmospheric road was never meant to be so creepy.

360° views of the city plus five floors of optical illusions and hands-on science.

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

Famously misunderstood wonder of the ancient world