From Muppet Wiki

Washington, D.C. is the capital of the United States of America. The city is named after George Washington, military leader of the American Revolution and first President of the United States.

• The Muppets' first appearances were on Washington television stations WTOP (The Junior Morning Show) and WRC-TV (Sam and Friends).

• The Muppets appeared at the 1993 Inaugural Celebration for Children event alongside the President and First Lady.

• Elmo and Rosita at the 2006 National Governor's Association Forum in Washington, DC.

• Sesame Street cast members and characters have made several appearances at The White House, including at the annual White House Egg Roll.

• The Smithsonian Institution, located in Washington D.C., holds many Henson artifacts including Kermit, Bert, Ernie, Oscar the Grouch, and parts of the original Sesame Street set.

• In Sesame Street Episode 1576, Madeline Kahn called the Bird Department in Washington, D.C. to find out if Big Bird was an endangered species.

• Just north of the Lincoln Memorial is the location of a statue of Albert Einstein featured in the opening credits of Sesame Street.

• In the 1993 book I Want to Be President, Betty Lou dreams of living and working in Washington as the President.