One of the few standing Roman lighthouses and a labyrinth of tunnels are a couple of the secrets at this historic castle.

A open air theatre built on a cliff by an eccentric British woman.

Puzzles within puzzles hide a golden treasure in this hedge maze.

A glorious pub known for a spiteful printing feud and its famous typeface lost—then found—at the bottom of the Thames.

These stark white cliffs were spat up by the sea and are slowly being retaken by it.

Public access to clean drinking water was an instant hit among the masses.

In Twickenham sits a small whitewashed castle that inspired Mary Shelley's 'Frankenstein.'

This beautiful Victorian ironwork masterpiece was built to keep London from smelling like poop.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

An artistic tribute to the famous singer, just around the corner from where he was born.

One of the largest sculpture collections in the U.K. features history's greats, from Bob Dylan to Galileo, in bronze.

A hidden treasure in London with a rich medieval history, and the resting place of many luminaries.

A house of bones — but nobody is quite sure to whom they belong.

Giant, friendly pelicans in Central London, the most unlikely of places.

Dictionary Johnson’s favorite feline.

This wildly-tiled artist's palace is a living and growing account of the creator's life, loves, and labors.

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

A metal tree emits eerie, melodic notes on top of Lancashire's Crown Point.

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

The world's first underground farm is in a World War II bomb shelter beneath the streets of London.

Catacombs turned marketplace.

A cluttered and astounding collection of antiquities and curiosities.

A mysterious artist-run cabinet of curiosities and library.

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