The Viking-Age Ring Fortresses, a UNESCO World Heritage site in Denmark, consist of five circular fortifications—Aggersborg, Fyrkat, Nonnebakken, Trelleborg, and Borgring—built around 975-980 CE under King Harald Bluetooth. Strategically located across Zealand, Funen, and Jutland, these precisely engineered earthworks, with their uniform design of ramparts, moats, and internal layouts, reflect centralized power and advanced military architecture of the late Viking Age. Recognized in 2023, they highlight Denmark’s pivotal role in unifying the kingdom and transitioning to Christianity, offering a rare glimpse into 10th-century Scandinavian society.

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