National Mall NPS
@NationalMallNPS
We're often asked why there's a color change in the stone of the Washington Monument. The color change marks how far the towering monument was lowered underground every night in the 1940s to help planes avoid it after National Airport opened on the Potomac. #WashingtonDC
9:04 AM · Apr 1, 2024
https://twitter.com/NationalMallNPS/status/1774784982906536035