Painters on the cables of the Brooklyn bridge, New York, 1914. Photo by: Eugene de Salignac

New Yorker reads a newspaper at 6th Ave and 40th St, “Nazi army now 75 miles from Paris”, in 1940. Photo by: NYC Municipal Archives

A man taking a book off the shelf in Cincinnati main library in 1874. Photo by: Public Library of Cincinnati and Hamilton County.

Cincinnati first incline, which went up to Mount Auburn, 1906. Photo by: unknown

Construction Of The Hoover Dam 1931-1936. Photo by: The Babcock & Wilcox Company

Testing a first bulletproof vest in 1923. Photo by: National Photo Company

Overhead view of men wearing hats, New York, 1930. Photo by: Margaret Bourke White

Ships Bear and S.S. Corwin sailing through the ice, Alaska, 1900. Photo by: unknown

Race from New York to San Francisco and back. Photo by: Detroit Publishing Company Photograph Collection

The first successful flight by Wright Brothers, 1903. Photo by: John T. Daniels

The first rocket launch from Cape Canaveral, Florida, 1950. Photo by: NASA

Hindenburg disaster, the German passenger zeppelin airship LZ 129 caught fire and was destroyed during its attempt to dock, 1937. Photo by: Gus Pasquerella