AN/FPS-35 Radar Tower and Antenna National Register of Historic Places Listing

Stand at Montauk Point and you cannot miss the brutalist concrete monolith rising out of the coastal scrub. It looms. Engineers built this 80-foot blockhouse in 1960 to support a colossal 40-ton steel antenna. The reflector sail stretched 126 feet wide. The military desperately needed this gear to spot incoming Soviet bombers. It worked, too, bouncing UHF radio waves off targets up to 200 miles away. This station plugged directly into the SAGE network. That was America's computerized shield. But the Montauk rig suffered from massive mechanical bugs. The giant sail spun on a single, massive bearing that wore down constantly. When it broke, the whole headland shook.

Most of these giant radars ended up in the scrap heap when technology marched on in the late 1970s. This Montauk tower survived because boat captains protested its demolition. They used the massive steel sail as a physical landmark for navigating the tricky waters of the Long Island Sound. It is the last of its kind. Beyond the Cold War history, the rusting dish sparked wild conspiracy theories about time travel and mind control. It actually inspired the hit show Stranger Things. You cannot climb it. Asbestos and decaying metal make the interior a toxic hazard. Still, the giant dish just sits there, rusting in the salt air. A grim relic of nuclear dread.