What are the town defenses in ancient rome?

It is in Italy. In many Roman maps Rome is placed in the very centre as they considered the city to be the centre of the world.

Yes, because rome was built on seven hills which protected it from attackers.

If you mean what inventions the Romans had that influence us today, well there are a couple. Things like pipes and roads and aqueducts and architecture, the Senate, the idea of a republic, their...

Rome conquered almost the whole Europe. It constructed a large network of roads used widely until asphalt roads replaced them. These are only some of the achievements of it

If you mean the city, then it was where modern Rome is now - on the River Tiber in central Italy.