Walled Towns Friendship Circle

Includes most of the towns and cities in Europe with surviving town walls. Photographs, information.
http://www.walledtowns.com/

The Fortress of Neuf-Brisach, France

Illustrated description from an exhibition at the National Gallery of Art, Washington, of the fortress town constructed 1698-1720, designed by Sébastien Le Prestre de Vauban.
http://www.nga.gov/exhibitions/2000/baroque/indepth6.htm

Castles in Africa

17th-century kings of Ethiopia created fortifications at Gondar inspired by Portuguese design. Photographs by Janice Dennie accompany text from Harry R. Atkins, 'Ethiopia: The Land of Enchantment'.
http://www.geocities.com/janicedennie/castletour.html

Fort Duquesne, Pennsylvania

Table Top Studios present their computer model of the fort c.1755 on the site of present-day Pittsburgh and explain how it was constructed from original plans.
http://members.aol.com/tabletopstd/Page4.html

Louisbourg

Attractive, well-organised site from Industry Canada giving an interactive plan, history, archaeology and images of the reconstructed 18th-century fortified town.
http://collections.ic.gc.ca/louisbourg/index.html

Fortress of Louisbourg

The Louisbourg Institute provides history, images, bibliography and visitor information for the fortified town in Canada, whose fortifications were rebuilt in the 1960s to their state in 1744. Searchable site.
http://fortress.uccb.ns.ca/homeeng/default.htm

Chester: A Virtual Stroll Around the Walls

Steve Howe of the Black and White Picture Place provides a guide around the Roman and medieval city wall. Map, modern and archival images with description and history, including quotations from primary sources.
http://www.bwpics.co.uk/chester.walls.index.html

York City Walls

Virtual tour of the ancient city walls provided by City of York Council.
http://www.york.gov.uk/walls/index.html

Stephen Wyley's Fortification Pages

Provides introductions with bibliographies to military architecture, siege warfare, castles and Anglo-Saxon burhs. Images and information on sites including Constantinople, Masada, Shiro and Ankara.
http://www.angelfire.com/wy/svenskildbiter/index.html

Crownhill Fort

History, plan and visitor information for this Victorian fortress outside Plymouth, UK, from the official site. Restored and owned by the Landmark Trust.
http://www.crownhillfort.co.uk

Medieval Fortifications

Expandable thumbnail images of Aigues-Mortes, Carcassonne and Pierrefonds in France from Jeffrey Howe's Digital Archive of Architecture.
http://www.bc.edu/bc_org/avp/cas/fnart/arch/medieval_fort.html

Fort McHenry, Baltimore, United States

Built 1794-1803 on a five-pointed star plan. Description and photographs from National Park Service Baltimore Travel Itinerary.
http://www.cr.nps.gov/nr/travel/baltimore/b1.htm

Coastal Fortification on the Gulf of Mexico

Andrew Bennett provides photographs and history of coastal fortifications of four generations from 1817 to World War II.
http://andy_bennett.home.mindspring.com/coastal.html

Fortress UK

John Bray traces the history of British fortifications from Tudor times until World War II, lists them by area with links, and lists related societies.
http://www.forts.org.uk

Fort Siloso

The story of the sole restored coastal artillery fort from Fortress Singapore, 1874 to the present.
http://www.fortsiloso.com

Castles, Fortresses, and Palaces of the World

Images and brief descriptions from Glass, Steel and Stone of a selection of major buildings from medieval to 19th-century.
http://glasssteelandstone.com/ByTypeCastles.html

Bunkertours

An extensive photodocumentary of numerous mothballed and redundant underground military installations in Britain and France, including photographs of ROTOR sites, the Maginot Line, and Cold War sites. Also provides reports from physical visits.
http://www.bunkertours.co.uk/

Northern Fortress

Fortresses of northwest Russia and Finland. Photographs, maps, histories, and personal observations.
http://www.nortfort.ru/

The South Coast Martello Towers

Peter Hibbs charts the history, construction, siting and individual history of each of the 74 English south coast Martello Towers.
http://www.martello-towers.co.uk/

UK Fortifications Club

Researches and records fortified sites throughout the UK. Journal, membership and news.
http://www.ukfortsclub.org.uk/

Fortifications of Malta

Illustrated history of the fortifications of Valetta and nearby Fort Manoel.
http://sites.waldonet.net.mt/malta/

Palmerston Forts Society

An educational charity dedicated to the study of Victorian fortifications in the UK and their artillery. Includes the activities of the group, list of forts and maps and plans.
http://www.palmerstonforts.org.uk/

The City Wall of Visby, Gotland

An illustrated description and additional photographs by Goran Andersson of the city wall, which has 36 towers still intact.
http://www.bingeby.com/city-wall-eng.html