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Making America's Best Idea Even Better
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Old Post Office Tower
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National Mall and Memorial Parks: Old Post Office Tower
900 Ohio Drive, SW
Washington, DC 20024

Phone: 202-606-8691
           202-606-8694
Photo Great Falls of the Potomac River.  

Did You Know?
The Great Falls of the Potomac River is the second largest in the state of Maryland. It is a series of cascading falls. Water drops 76 feet in two-thirds of a mile. Natural hazards in the Potomac such as water falls and rapids created the need for canals for reliable water transportation.

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Last Updated: November 30, 2008 at 14:44 EST