At the right time of day, sunlight floods through the roof of this cave and illuminates the small pavilion hidden within.

This ancient fortress was once the setting for a strange battle won with the help of a lizard.

A library of rare occult books in Los Angeles.

Rare recess caves fill this unbelievably beautiful Ohio park.

An institution dedicated to curiosity, logic, riddles, and Mongolia's long history of puzzles.

The grassy landscape is home to the world's last truly wild horses.

This hulking behemoth is actually five interconnected towers built in the 1960s.

It's 2 billion years old!

The site of many tense prisoner exchanges across the Military Demarcation Line between North and South Korea.

South Korea's women of the sea have completely flipped their society's structure by becoming revered fisherwomen.

South Korea's love of the silly photograph is on full display at this goofy collection of trompe l'oeil paintings.

A submerged archeological park still holds the wonders of a Roman Sodom.

This open-air mosaic gallery honoring an English artist took hundreds of volunteers more than seven years to create.

This steep cable railway has been hoisting passengers in the heart of Québec City for over a century.

This frozen tunnel in central Alaska is both an engineering feat and a valuable climate classroom.

This sky-high radio mast is formerly the tallest man-made structure in the world.

A monument to the center of the North American continent may be off by a few miles.

Three legendary, living albino buffalo roaming their pastures for all to see.

Pause in an abandoned hydroelectric station, now overrun with wildlife, to consider a thought-provoking poem.

This free, take-a-book shop seems like a trick but isn't.

These curious caverns have been home to mushrooms, gangsters, and disco.

This large midwestern cavern features impressive rock formations and an underground waterfall.

This lab's maddening silence is good for business but bad for sanity.

A grove of colossal man-made flowers built to collect the sun's rays.