On the southern side of the common, the misnamed Caesar's Camp is what's left of a roughly circular earthen fort built in the .

The third image held no people, just a view of a small circular fort containing a large iron caldron.

A circular defensive fort, usually built of stone.

The main structure is a circular fort with a diameter of 53 meters, with 48 firing ports for cannon on two levels of 24 casemates each.

Photos suggest that Martello Menara was not a true Martello, but rather a circular fort.

A circular fort with a diam.

The townspeople constructed the circular fort day and night until it was completed.

(g) Tor of Craigoch circular fort with outer defences.

The Celtic circular fort at Otzenhausen is one of the biggest fortifications the Celts ever constructed.

The circular fort has a diameter of 210 metres, making it the largest of the hill forts known in Norfolk.