P4014580-01_r by gildas_29 on Flickr.

P4014580-01_r by gildas_29 on Flickr.

Pont Valentré (XIVème s.), Cahors, Lot, Midi-Pyrénées, France by Afchine Davoudi on Flickr.

Pont Valentré (XIVème s.), Cahors, Lot, Midi-Pyrénées, France by Afchine Davoudi on Flickr.

Szulyó vár panoráma - Vertical Panorama of Castle Ruins Szulyo in Slovakia, Fatra Mountains by Pozor Vlak on Flickr.

Szulyó vár panoráma - Vertical Panorama of Castle Ruins Szulyo in Slovakia, Fatra Mountains by Pozor Vlak on Flickr.

Ireland 2009, Cahir Castle Portcullis by divemasterking2000 on Flickr.

Ireland 2009, Cahir Castle Portcullis by divemasterking2000 on Flickr.

Bergamo - Castello di S. Vigilio by glemonz7 on Flickr. Via Flickr: Dentro la torre/inside the tower

Bergamo - Castello di S. Vigilio by glemonz7 on Flickr.

Via Flickr:
Dentro la torre/inside the tower

César tower, Corrèze, France. 11th c. by Vaxjo on Flickr.

César tower, Corrèze, France.

11th c.

by Vaxjo on Flickr.

Lonely tower. by Royston Palmer on Flickr.

Lonely tower.

by Royston Palmer on Flickr.

Honfleur medieval houses, Normandy, France. by EasyriderFXDWG on Flickr.

Honfleur medieval houses, Normandy, France.

by EasyriderFXDWG on Flickr.

Tréseau tower from Carcassonne castle, France. by Erminig Gwenn on Flickr.

Tréseau tower from Carcassonne castle, France.

by Erminig Gwenn on Flickr.

Samois door, Moret-sur-Loing, France. by jeanpierreossorio on Flickr.

Samois door, Moret-sur-Loing, France.

by jeanpierreossorio on Flickr.