St Mary Aldermanbury

St. Mary Aldermanbury was a church in the City of London first mentioned in 1181[1] and destroyed by the Great Fire of London in 1666. Rebuilt in Portland stone by Christopher Wren, it was again gutted by the Blitz in 1940, leaving only the walls standing. In 1966 these stones were transported to Fulton, Missouri, by the residents of that town, and rebuilt in the grounds of Westminster College as a memorial to Winston Churchill. Churchill had made his Sinews of Peace, "Iron Curtain" speech in the Westminster College Gymnasium in 1946.

More information on the Wikipedia page.