Gavin Hellier / Fort Hamilton, erected in the mid-19th century, the ramparts are mounted with muzzle-loader guns capable of firing a 400lb cannonball through an 11 inch thick iron plate, Hamilton, Bermuda 2009

Benoit Stichelbaut / Concarneau, Finistere, Brittany, France

Benoit Stichelbaut / Concarneau, Finistere, Brittany, France

Benoit Stichelbaut / Beach beneath ramparts, Saint Malo, France

Benoit Stichelbaut / Beach beneath the ramparts of Saint Malo walled city, Brittany, France

Benoit Stichelbaut / Fishing boats moored alongside jetty in Concarneau, Finistere, Brittany, France

Bernard Castelein / Long-billed vulture (Gyps indicus), on the ramparts of Meherangarh Fort overlooking Jodhpur, Rajasthan, India

Bernard Castelein / Long-billed Vulture (Gyps indicus) adult on the ramparts of Meherangarh Fort, Jodhpur, Rajasthan, India

Matthew Maran / Toque Macaque {Macaca sinica} silhouette on ramparts, Dambulla, Sri Lanka

DAVID TIPLING / Jaisalmer city viewed from fort ramparts, Rajasthan, India

Gavin Hellier / Street cafe tables in street next to ramparts at Tossa del Mar, Costa Brava, Catalunya, Spain

PREMAPHOTOS / Ants nest holes with ramparts built to prevent flooding. South Africa