Nikola Tesla in his office at 8 West 40th Street, New York City in 1916
This photograph of Isambard Kingdom Brunel, considered "one of the most prolific figures in engineering history" was taken 160 years ago.
A group of bootblacks gathers around an old Civil War veteran in Pennsylvania, 1935.
A young Arnold Schwarzenegger posing at the Victoria Palace Theatre in London ~ 1968