Concrete Arrows and the U.S. Airmail Beacon System

Scattered across the United States are a network of mysterious concrete arrows. They are often found in remote locations or areas difficult to access. Some will be accompanied by a small shack, a few have a metal tower affixed to their base. Many are in good condition while others have succumbed to nature. The shape … Continue reading Concrete Arrows and the U.S. Airmail Beacon System