Mysterious craters may have been home to an ancient cult.

Ancient cliffs resembling a kilt on Scotland's second largest island emit an entrancing sound.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

This castle was established by the 4th Duke of Montrose and is connected to the Buchanan Clan.

The mystery of this small, brick pond eluded its possibly only investigator until his death.

Stone pillars and a petrified wedding party in the hills of North Macedonia.

Hideout of thieves, monks, and goat-footed gods.

A spectacular cave and a beguiling lake.

Monasteries on rock pillars, once accessible only by frayed ropes.

A naturally beautiful, seemingly bottomless deep blue spring.

A forest full of mystical fantasy figures, nearly destroyed by recent fires.

Rock-cut cave complex filled with ancient Buddhist artwork.

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

Temple of a million beers.

A sulfuric martian landscape that looks far better than it smells.

One of two side-by-side totem pole parks dedicated to educating visitors on Tlingit history and culture.

The home of one of America's most wealthy industrialists is now a historic site that remembers a more decadent time in the country's history.

Edgar Allan Poe's old dorm is now a shrine to the author's legacy.

This 14th century castle withstood years of battle but is now sliding off the hills into the Danube.

This elephant kraal is the only one remaining in Thailand, dating back to the 16th century when these massive mammals were integral players in war and trade.

Stalin's march toward a more modern USSR flooded a monastery, leaving a unique and extravagant nautical marker, "The Flooded Belfry."

Each year these high desert hills are absolutely covered with poppy flowers in a surreal show of nature.

This home is decked out like a psychedelic explosion of colors and bowling balls.

The vaguely man-shaped root that ate the body of the founder of Rhode Island.