This operational mill has survived centuries of destruction and construction.

Human-made caves excavated to hide a secret society of wealthy pagans.

Model aircraft soar over 360-degree views of the countryside at the start of England's oldest road.

This suburban British town holds secrets that would have made the druids proud.

Museum celebrating the history of computers, especially their role in codebreaking.

Home to Alan Turing, the cracking of the Enigma code, and Captain Ridley's shooting party.

This hanging crocodile is thought to be the "dragon" that once plagued a Czech city.

A peculiar clock commemorates a historic victory won by ringing the noonday bell an hour early.

Mummified monks and the accidentally interred, in a 17th-century crypt.

Europe's second largest ossuary wasn't discovered until 2001.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

The sign at the garden gate reads: "These Plants Can Kill."

The world's only museum devoted to the wonders of fluorescence.

The majority of the museum's large collection is held in a storage space open to the public a few times a year.

Mary Kelly was last seen here before she was murdered by Jack the Ripper.

Eighty million natural history specimens call this gargantuan museum home.

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

After starting as a whimsical tourist attraction that eventually found its way to ruin, these renovated canals offer a lush and exotic locale on the Pacific Coast.

The biggest and deepest Cold War bunker open to the public can be found in southeast England.

A giant roundabout made up of six smaller roundabouts can befuddle the uninitiated.

This unusual geoglyph was built as a warning so low-flying aircraft wouldn't scare the zoo animals.

The first peace pagoda to be constructed in the Western world sits next to a small English lake.

This famous Nevada gold mine, once a hotbed of Wild West shenanigans, is now open for tours.