Smithsonian Castle in Washington D.C.

A majestic Gothic Revival structure stands proudly under the partly cloudy sky of springtime at the National Mall in Washington DC. This is the Smithsonian Institution Building, commonly known as 'Castle', which serves both an architectural landmark and houses several museums including the Museum of American History. Its red sandstone façade features pointed arches, intricate tracery windows, and twin towers topped by statues and capped with flags fluttering gently in the breeze.