1. A polar explorer offers a can of condensed milk to a polar bear, USSR, 1980s.
2. A nanny poses with her young charge, Farrokh Bulsara, in Zanzibar, 1947. Twenty-five years later, he would become known as Freddie Mercury.
3. A Sioux tribe member and his horse, 1905.
4. A 7,600-ton housing block is moved in order to extend an avenue in the Romanian City of Alba Julia, 1987.
5. Claude Monet and his paintings, 1923.
6. The Beatles performing for 18 people in a club in the town of Aldershot, December 1961. One year later they would be known worldwide.
7. Marilyn Monroe joking and posing for soldiers, 1954.
8. The seal on Tutankhamen's tomb, 1922. It had been left untouched for over 3000 years.
9. Two soldiers during World War II, Easter 1944.
10. A boy distributing newspapers shortly after the sinking of the Titanic, 1912.
11. The world's first ever five-megabyte hard drive is loaded onto a PanAm plane, 1965.
12. The Hindenburg disaster, 1937.
13. The world's first telephoto lens, 1900.
14. A Singaporean opium den.
15. A car accident in Washington.
16. A pilot flight simulator, 1942.
17. Newspaper sellers taking a cigarette break, 1910.
18. A beggar chases after George V, 1920.
19. A gas station in Washington, DC, 1924.
20.Testing a bulletproof vest, 1923.
21. Steven Speilberg during the shooting of Indiana Jones, 1980.