Scattered across the wilderness in several American states, these enormous yellow markers look like they were built for alien invaders with a poor sense of direction, or a Godzilla-sized monster who lost his way... but their real purpose goes back to a forgotten chapter in US history.
Dozens of the eerie arrows, some measuring up to 70 feet long or more, are embedded in the desert sand, the Midwestern plains, and many other wide open spaces. Their original function: to guide cross-country Air Mail planes, before the advent of radio communication.
The markers, along with 50-foot beacon towers, were first built in 1924, placed around 10 miles apart along Air Mail routes to assist pilots making their deliveries by night or in bad weather.
Photo5: Marc Weaver/Deseret News
After radio became available, most of the towers were dismantled and used for scrap metal during World War II – but some still remain, in some cases preserved and restored by historical societies. Most of the arrows are in bad shape, but are still visible from the air... you can even spot some of them using Google Maps.
These aren't the only bizarre structures we've found in the American wilderness... there's also these creepy domes scattered across the Arizona desert, allegedly the home occult rituals, wandering ghosts and more!