The way that light hits a stained glass window on a specific day is one of many "clues" to a mysterious treasure.

South of Bologna, a limestone grotto with a protruding waterfall and a floor full of cave pearls.

Out of a labyrinth of abandoned tunnels and stops, this Queens subway station is arguably the most mysterious—if it exists at all.

Centuries after this 12th-century abbey had fallen to ruin, it became known for the strawberries and cream served in its gardens.

The only thing still moving in this town is the eponymous hot spring.

The signatures of esteemed colleagues of the physicists who stopped by to attend lectures.

On the edge of this small Washington Park, a piece of the Earth's mantle has come to the surface.

This Connecticut video store has a vast and varied archive that contains everything from 'Koyaanisqatsi' to 'The King's Speech.'

On this headland lies a 19th-century lighthouse and historic gun battery.

An unassuming corner inside downtown Orlando's library offers a whole new world of the park and its history.

The best way to get a sneak peek at the movies.

This location holds the truth to what truly happened that faithful night.

Cooled, fractured lava formed this geometric rock feature.

The only known mosaic depicting the Greek god of sleep, Hypnos.

This theater opened in 1998, but both the building and the puppeteers who perform there have a distinguished history.

You can find America's highest suspension footbridge at Grandfather Mountain in North Carolina.

After sitting unused for decades, this abandoned communist infrastructure became a wildlife utopia.

William Buckley escaped from prison and is said to have spent years hiding in this seaside cave.

This cemetery is one of the last remaining traces of a drowned old Western town.

This effigy was crafted to annoy a neighbor after a civil dispute over a foul smell.

This modern tandoor eatery was once a canteen for Soviet farmers.

Dr. Henry Cogswell hoped that his elaborate drinking fountains would dissuade people from drinking alcohol.

Beside the pew where C.S. Lewis often sat while attending church, a window filled with characters from his beloved stories.

Outside the Missouri Quilt Museum, this large spool has more than one million yards of thread—and counting.