This wonderful old photo of Pennsylvania Avenue in 1957 shows President Eisenhower and Queen Elizabeth in an old Lincoln Cosmopolitan.

Queen Elizabeth and President Eisenhower in 1957
Source: Flickr user Dave Gelinas
And here’s another.

1950 Lincoln Cosmopolitan Presidential Limousine – Bubble Top Parade Car – Presidential Motorcade – President Eisenhower – Queen Elizabeth – United States Visit – Washington DC – October, 1957
Source: Flickr user Dave Gelinas

1950 Lincoln Cosmopolitan – Presidential Limousine – Bubble Top Parade Car – Presidential Motorcade – President Eisenhower – Queen Elizabeth – United States Visit – Washington D.C. – Circa 1957
Source: Flickr user Dave Gelinas