roman arch

An arch in Rome - a part of the Colosseum. Unlike the ancient Egyptians, the Romans understood and used the arch which opened all kinds of construction possibilities. The Romans also invented concrete! Well they did not actually invent it because the Egyptians used a type of concrete in the pyramids - but the romans came up with "opus caementicium" which for all intents and purposes is the same as todays modern concrete, which gave them even more architectural possibilities because it was much lighter and stronger than stone.

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