Czechoslovak Fortification 1938. - Profile of the ultimately futile fortification systems constructed by the Czechs prior to the Nazi invasion. www.rudolec.cz/forts/index.html
The Maginot Line - History and description of the Maginot Line of fortifications along the French-German border. www.ifrance.com/letunnel/maginot-e.html
UK World War 2 Pillboxes and Anti-Invasion Defences. - Photos of locations in the United Kingdom showing pillboxes and other defences built to resist a German invasion in World War 2. uk.geocities.com/pillboxesuk
WW 2 Tunnel and Shelter Researching - Offers descriptions of secret tunnels built by the Germans during World War Two for rocket research, and airplane building. www.geocities.com/CapeCanaveral/1325
