Western Europe's only representation of a Roman goddess still in its original location sits in an unassuming park.

The remains of a bustling turn-of-the-century park built to showcase the wonders of electricity.

An eccentric inventor's castle home with its own indoor weather system.

This tiny patch of arid sand sits in one of the greenest states in the United States.

Romans built the world's tallest artificial waterfall in 271 BC.

The ill-fated plan to reroute the Mississippi so that Union ships could bypass Confederate fortifications on the river bend.

The abandoned "Ghost Mansion" was left to decay in the mountains of Northern Italy.

A metal ring in the middle of the road marks the exact spot where the Soviet satellite crash-landed in 1962.

Legions of Roman soldiers bathed in this ancient spa complex under a Budapest transit station.

This long-distance walking route follows the Prime Meridian line as it passes through England.

Neither Spanish settlers nor anyone since has been able to tell who built these strange California rock walls.

The oldest orange tree in California spawned a generation of citrus farmers.

A plaque marks the underground site of one of London's "lost rivers."

This sword isn't waiting for a king to pull it out. It was placed there by a saint.

A spitting ode to a German serial killer.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

A 6th-century stone lies at the site of the mythical battle waged between King Arthur and his nemesis Mordred.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

The site of the little-known Pennsylvania battle that sparked the Seven Years' War.

This headstone-like marker inscribed with three words has been an utter mystery for over a century.

A controversial artwork draws attention to the dark history of Prague's "Suicide Bridge."

The storied English village that pretended to be insane inspired NYC's nickname and the fictional namesake in the DC Comics universe.

A reclusive Memphis neighborhood is home to decades worth of misunderstood Masonic folk art.

One of the oldest masonic temples in the Netherlands, built in 1757.