Entrance of Schoenenbourg Fortress, complete with painted on embrasures, Bas-Rhin department, France, Europe

Talaia d'Albercutx, an old Pirate Watch Tower at Cape Formentor, Majorca, Balearic Islands, Spain, Europe

Talaia d'Albercutx, an old Pirate Watch Tower at Cape Formentor, Majorca, Balearic Islands, Spain, Europe

Segringer Tor (Segring gate) in Dinkelsbuehl, Central Franconia, Bavaria, Germany

Cannon and loop-hole, Ciudad Velha, Cidade Velha, island of Santiago, Cabo Verde, Africa

View through a keyhole in the castle walls onto parts of the outer castle complex, Hohenrechberg Castle near Schwaebisch-Gmuend, Baden-Wuerttemberg, Germany, symbolic image, Europe

View through loop-hole to city and sea, Ciudad Velha, Cidade Velha, island of Santiago, Cabo Verde, Africa

Wall with crenels and blue sea, Castle Alanya, Turkey

Embrasure in the city wall in Strausberg, Brandenburg, Germany, Europe

View from embrasure at Torre des Verger, stone tower on the coast, sea view, Banyalbufar, Majorca, Balearic Islands, Spain, Europe