4 ч 48 мин, 2 сент 0 г. - Colosseum

Описание:

70-80 CE
Stone and concrete
Rome, Italy

floor was made of sandstone to soak up blood

Exterior of Colosseum was made of travertine and the inside of concrete.
Romans were first to use concrete. This gave them the ability to create a building of this size.

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