Traders on the floor of the New York Stock Exchange watch monitors for transactions on Black Monday, 1987.

Calamity Jane at the Pan-American Exposition in Buffalo, New York, circa 1901.

British Army recruiting sergeants outside a public house at Westminster. 1877.

Tourists pose on Glacier Point above the Yosemite Valley. 1887.

The bloody mountain warfare on the Italian front: Austrian soldiers descend a cliff, 1915.

New York firefighters battle a blaze while coated with icicles. 1940.

The Lebanese Civil War: A couple poses near their home on their wedding day in East Beirut, 1989. .