These are some of the tools they used:
The forum is an open area surrounded by walls with lots of shops. The forum was the most important public area. In the middle of the town is the forum and also a market place. Many Roman towns had communal public bathrooms. The seats were set over a brick-lined drain where water ran to take the waste away.
This is what a Roman town looked like:
They introduced concrete. The Roman ceilings were flat and made out of planks and plaster. There were two main streets in the town. Romans set up forts and strategic points throughout the empires.
They improved the arch by inventing the dome.
Roads were usually very straight, and carefully built with a hump, so water would run off the road.
Originally amphitheaters were built out of wood, then by stone. The first wood amphitheater was made in 59 BC. The first stone one was built in 38 BC. It seated about 87,000 says a 4th century document. People today say it seats about 50,000. They were all about the same size.