Cabot Tower is now the centre of Signal Hill National Historic Park.
There was a mast at the highest point on the hill, and it would be the job of a signalman to keep
an eye out for ships approaching St. John's. When one was spotted he would indicate by flag what
type of ship it was, what country it was from and fire off a peterra so that the men below in the
town would know to look towards the Hill. Then they would fire the same type of cannon in response.

Marconi Wireless Station operated on the second floor of Cabot Tower for many years afterward.