How were fortified hill camps built?

Pnyx hill also known as Ekklesia was built by Greece people (Athenians)

For protection and for the view. Usually, the city backed up against the hill with a castle or defense on the top. With this arrangement guards could see for miles around to watch for any invading...

The original keep of Cardiff Castle was built on a motte, which was a small hill. The castle was extended around this, however, and most of it was not above the surrounding countryside.

Not all hospitals are built on hills. Traditionally, important building have generally been built on elevated areas. Building on hills provided better ventilation and less exposure to disease in...

I think you're confusing London with Rome.