Capital Beltway
The Capital Beltway, designated as Interstate 495 (I-495) for its entire length, is an auxiliary Interstate Highway in the Washington metropolitan area. The 64-mile (103 km) beltway encircles Washington, D.C., the capital of the United States, and its inner suburbs in adjacent Maryland and Virginia. It also passes through the capital, near the western end of the Woodrow Wilson Bridge over the Potomac River; Prince George's and Montgomery counties in Maryland and Fairfax County; and the independent city of Alexandria in Virginia.
Source: Wikipedia
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