https://m.youtube.com/watch?v=9EldWveTckw
1837 - Floridsdorf-Deutsch Wagram Railway opens in Austria.
https://m.youtube.com/watch?v=a99DiUf3Tno
https://m.youtube.com/watch?v=U1ADr6R5k3s
1936- Main span of the Golden Gate Bridge is joined
https://youtu.be/3IChCWE0kok
https://youtu.be/-Ofmi-lkd04
1959- De Beers announces synthetic diamond
https://youtu.be/6GkLom_erFA
https://youtu.be/FMogwosL694