The lowest point in South Dakota and the source of the Minnesota River.

A striking sculpture built to honor the women of the Lakota and Dakota Nations.

One of America's first dinosaur parks gives a window into Depression-era paleontology.

Hidden behind Lincoln's head is a 70-foot-long chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

Twenty-seven massive radio antennas on the high plains of New Mexico search for life on other planets.

A perilous medieval road leading right into the sea.

This tiny little cave was said to have been a refuge for a saint with a glowing arm.

This one has sailed five times as far as Sir Francis Drake's famous ship.

This tiny island featuring 9th-century Viking ruins is only accessible at low tide.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

This tiny little pool is said to be home to a malicious mermaid named Jenny Greenteeth.

Local legends say that fairies used to dance in the moonlight here and invite handsome young men into their grottoes.

During this Shetland Islands celebration, hundreds of torch-carrying "guizers" lead a procession to burn a viking longboat.

Follow the original medieval paths that wind through this intriguing section of the city.

Large-scale contemporary artworks tower over fields and lurk in forests around a Jacobean manor house.

The Stonehenge of Wales is one of the grandest neolithic dolmens still in existence.

The ruins of an 11th-century Norman castle with a rare, perfectly circular shape.

A midnight snack that lights up the night.

Cliffs full of fossils at the portal to England's Jurassic Coast.

This 1920s Dutch barge is now a floating bookstore.

This small collection of rare books was uniquely locked up for safe keeping.

These lovely Turkish-styled baths were brought back to life after winning a reality show competition.

A statue in the heart of Edinburgh honors a bear that served in the Polish military during World War II.

This picturesque archeological site looks like it was pulled straight from a fantasy novel.