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A remote island marking the entrance to Death’s Door, surrounded by the bones of ships who failed to heed her warnings.

Oldest surviving milestone in Europe outside of the Roman Empire.

This bright ship once guided vessels towards the Port of Southampton.

A concrete arrow from a 1920s airmail navigation network.

For centuries, this hill along the Polish coast has been used as a lookout—and the rumored home of pirate treasure.

A well-preserved example from a 1920s network of airmail navigation arrows sits near Interstate 15 in southern Nevada.

This stone in Lake Geneva was once the reference point used to determine altitude in Switzerland.

Ships still use this historic lighthouse to navigate dangerous, island waters.

Though it looks like a golf ball teed up for a hit, this hilltop station is actually used to monitor air traffic.

A concrete arrow from a 1920s network of airmail beacons is still preserved at the western edge of suburban Reno.

This crumbling coast and its teetering tower are literally filled with history, but they are also at great risk of becoming history themselves.