The Washington Monument is an obelisk on the National Mall in Washington, D.C., built to commemorate George Washington, once commander-in-chief of the Continental Army and the first American president. Located 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 tall according to the National Geodetic Survey or tall according to the National Park Service . Wikipedia*
On the C-SPAN Networks:
The Washington Monument has 2 videos in the C-SPAN Video Library; the first program was in a 1998, Rally Supporting Clinton Investigation.