The National Park Service says the Washington Monument remains closed indefinitely to visitors because of damage sustained during last month's earthquake.
Officials say there is no timetable for reopening the structure.
Structural engineers have done a preliminary inspection inside the monument, where numerous cracks and chips were found after the 5.8-magnitude quake on Aug. 23. Starting Tuesday, engineers will begin rappelling down the sides of the monument to check for damage outside.
Chip Somodevilla / Getty Images
U.S. Park rangers walk on the National Mall near the Washington Monument August 24 in Washington, DC. The National Park Service reported more internal damage to the Washington Monument then originally disclosed. The site was indefinitely closed August 23, 2011 after a 5.8 magnitude earthquake struck.
Incredible new images were released Monday showing what it was like inside the Washington Monument as an earthquake hit in late August. The monument has not re-opened since. NBC's Tom Costello reports.
National Archives / Getty Images
The Washington Monument is under construction in 1859 in Washington D.C.