Featured News. Greens Sand has been in the silica sand industry since 1979 and has been a distributor of specialised silica sand to the Industrial as well as Leisure market for over 30 years, distributing nationally and across borders. We store a wide range of grades of silica sands.
Standing almost due east of the Reflecting Pool and the Lincoln Memorial, the monument, made of marble, granite, and bluestone gneiss, is both the world's tallest stone structure and the world's tallest obelisk, standing 555 feet 7 11â32 inches (169.351 m) tall.t the time of its completion, it was the tallest building in the world, a title it retained until the Eiffel Tower was completed in 1889; however, the Washington Monument is still the tallest stone structure in the world.
The Washington Monument does not measure 666 feet tall. People need to double-check facts before running with information. The foundation is actually 36 feet 10 inches deep as reported on Wikipedia.org and the official height is 555 feet 5-1/8 inches as reported by the National Park Service website, so the total height would be 592 feet 3.125 inches.