360° panorama by Gary Davies.
Click the image to open the interactive version.

Named Montgomery after the Norman lord who established a motte-and-bailey wooden fort at nearby Hen Domen, the present castle was built in the early 13th century, during the reign of Henry III. It sits on a hilltop with commanding views over the mid-Wales border.  Having survived several attacks by Welsh forces throughout the 13th century, it ultimately met its fate in 1649, when it was comprehensibly slighted after the English Civil War.

http://www.360cities.net/image/view-from-the-defensive-ditch-at-montgomery-castle-wales