From the Super Mario Wiki
(Redirected from Washington)
Washington, D.C. (Washington, District of Columbia) is the capital city of the United States of America. Many famous and important buildings are located in the city, including the White House and the Washington Monument.
Washington, D.C. is featured in The Adventures of Super Mario Bros. 3 episode "Reptiles in the Rose Garden". Because Bowser wants to take over America for Kootie Pie, he has to fly to Washington on the Doomship and warp the White House to Dark Land. While the White House is gone, Kootie Pie rules as "Empress of America" and announces her "new laws". Eventually, Mario returns the White House to Washington and warps Kootie Pie home.
In Mario's Time Machine, Mario travels back in time to the White House in 1863 (although the Timulator only says "Washington, D.C."), as he needs to return the Spectacles of the then-president Abraham Lincoln.