An ancient and audacious architectural marvel over 12,000 miles long.
A colorful Spanish colonial town surrounded by fortifications.
A medieval fortress town in a dramatic location, perched on cliffs.
A massive mud-brick fortress, the capital of the Banu Nebhan and the centre of Ibadism in the Middle Ages.
A historic castle used as palace, fortress and prison since the days of William the Conquerer.
An important example of military fortress architecture on a group of islands off Helsinki.
An ancient walled city where Ottoman structures were built on top of a Crusader-era fortress.
A 17th-century British fort built by imported African slaves to defend St. Kitts against the French.
Six ornate and unique forts, legacies of the Princely Rajput states.
A charming and well-preserved colonial fortified city in Sri Lanka.
A city and military complex that exemplify Caribbean cities of the British colonial period in terms of their architecture and layout.
A largely intact earthen fortified village that lends insight into traditional Moroccan life.
Colonial-era structures that demonstrate defensive architecture as it was adapted from European designs for a tropical environment.
Impressive fortifications and the original urban center of a historically important city.
Ruins of Spanish colonial-era fortifications extending along the Caribbean coastline of Panama.
A planned 18th-century walled city, famous for its pink architecture.
A remarkably well-preserved complex of medieval Muslim architecture mixing Moorish and Spanish elements.
A classic medieval fortified town with intact walls, a castle, and a Gothic cathedral.
An excellent example of colonial military architecture in an important location for Caribbean exploration and trade.