| Answer | Crossword Clue |
|---|---|
| hillfort | a fort built on a hill |
| hillforts | HILLFORT, a fort built on a hill |
| acropolises | A citadel or fortified part of an ancient Greek city, typically built on a hill |
| acropolis | A citadel or fortified part of an ancient Greek city, typically built on a hill |
| tunnels | An artificial underground passage, esp. one built through a hill or under a building, road, or river |
| DUQUESNE | Fort that Pittsburgh was built over |
