This is a list of fortifications past and present, a fortification being a major physical defensive structure often composed of a more or less wall-connected series of forts.
This is a list of fortifications past and present, a fortification being a major physical defensive structure often composed of a more or less wall-connected series of forts. (en)
Deze pagina bevat een lijst van de belangrijkste militaire verdedigingslinies. Een verdedigingslinie is een aaneenschakeling van versterkingen en forten of kastelen. (nl)