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.

A mining town once rife with murderous disputes over its copious treasures now creates income as a popular spot for photo shoots.

A museum and gardens with unusual plants and a history of progressive programming for the blind.

Catacombs turned marketplace.

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

The largest greenhouse in the world is home to over one million types of plants.

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

One part local history, 99 parts gruesome haunted house.