Home to the world's largest refracting telescope and the birthplace of modern astrophysics.

This lakefront cottage was crafted in the 1800s and was once a sanitorium.

A remnant of the last Ice Age, this lake is surrounded by fascinating rock formations.

"World's largest scrap metal sculpture" stands in an outdoor sculpture garden in the middle of Wisconsin.

A town filled with hot chocolate, dazzling lights, and lots of Christmas cheer.

A 100-year-old chair with joints "cemented by nature."

Home to the "Circus" trees created by Axel Erlandson.

The artist David Nash planted a circle of trees in 1977.

This Sumatran root bridge took almost 30 years to knit itself together.

Natural cathedral designed by Italian artist Giuliano Mauri.

A rocky sea serpent hides caves, blowholes, and a spectacular natural bridge.

A terrific purveyor of natural history objects and curios.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

This faux-seedy Japanese arcade is made up to look like a maze of alleys straight out of a cyberpunk dystopia.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

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

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

A psychedelic labyrinth on the San Francisco bay.

A layered tribute to the work of mosaicist Isaiah Zagar.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.