> "most of Washington was built across the low-lying terrain of a former swamp" Not true. https://www.washingtonpost.com/posteverything/wp/2014/08/29/no-dc-is

> "most of Washington was built across the low-lying terrain of a former swamp" Not true. https://www.washingtonpost.com/posteverything/wp/2014/08/29/no-dc-isnt-really-built-on-a-swamp/ https://www.washingtonpost.com/posteverything/wp/2014/08/29/...