The 1965 Chagan nuclear explosion was part of Russia’s Nuclear Explosions for the National Economy program. The idea was to use nuclear explosions for peaceful civil engineering projects. The 140 kiloton explosion created a 100 metes (328 ft) deep lake and dammed a nearby river.
Motorcycle Chariot Racing, August 7, 1925 (London, England, UK):
Original caption: A new and novel sport in the form of chariot racing has been introduced in England by F. Mockford of the Sydenham and District Motorcycle Gymkhana at the Crystal Palace, London. The right side of the picture looks right enough, and so does the left, when each is considered separately, but the two together is enough to make the ancient Romans turn in their graves. Credit: Bettmann/CORBIS
[…] The program of police events include chariot races, motorcycle football, mass physical drills, exhibitions by the mounted squad, and “Fighting Crime,” which will be presented by the detective bureau.
Chariot of 1938 Ben Hur Drawn by Four Motorcycles: