Centuries-old bridges grown from tangled roots.

Ancient human, animal, and geometric figures drawn in the earth.

These ruined Incan mausoleum towers still bear carvings of sacred animals on their blocks.

A mysterious pre-Incan ruin believed to have miraculous healing powers.

Nazca pilgrimage site covering 370 acres is a popular stop for archeologists and looters.

A set of ancient drawings in the desert of Peru that are so massive, many of them can only be fully seen from the sky.

A formerly glacier-tipped volcano that inspired none other than Jules Verne.

This famous city eluded concrete detection until the early 2000's.

The site where one of the most famous poems of World War I was composed is preserved to honor the legacy of the work.

The wooden octagon in which Huckleberry Finn and A Connecticut Yankee were born can still be visited in upstate New York.

The alpine falls where Sherlock Holmes apparently met his demise can actually be visited.

The place to be if you love vintage Swedish cars.

Despite the groans of archaeologists, this astounding groups of Bronze Age petroglyphs have been painted red for tourists.

According to legend, this boat-shaped henge is built over the grave of a mythic king.

This encrypted monolith protected a secret of Norse mythology by hiding in a church wall for over a millennium.

The internet as provided by a James Bond villain.

From Coke II to Google Glass, this exhibit features some of the most spectacular commercial flops.

An illuminated manuscript comprising the life's work of a lone monk, inexplicably decorated with a portrait of Satan himself.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

Monuments don't get much more metal than these three giant viking swords planted in a Nordic hill.

The convergence of two currents makes this a surprisingly pleasant getaway in the Arctic Circle.

Home to three historic ships from the age of Vikings.

Walk 2,300 feet above the ground on the "Troll's Tongue."

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."