#citadel

• Acropolis — A fortified area, citadel, or structurally reinforced upper part located at the center of major ancient Greek cities (poleis). This fortified precinct, typically situated on a hill or an abrupt rocky prominence, housed the primary temples dedicated to patron deities, the public treasury, and the rulers' palaces, while also serving as the ultimate strategic refuge for the population during a siege or war.
• Aiud — A municipality in Alba County, Transylvania region, situated on the middle course of the Mureș River. The locality holds significant historical and cultural importance, being documented since antiquity as a Roman settlement (Brucla) and later, in the 13th century, under its current name. The city is internationally recognized for its fortified medieval citadel (14th-16th centuries), the historical academic college founded by Gabriel Bethlen, and for the grim memory of its communist-era prison, where numerous political prisoners were held, functioning today as a major point of historical reference.
• Ardud — A town in Satu Mare county, Romania, situated within the historical region of Țara Codrului. From a structural-geographical and historical perspective, the locality is renowned for the Ardud Fortress (built in the 15th century by Bartholomew Dragfi), a place steeped in medieval legends and a nodal point in Transylvanian history, where the Treaty of Satu Mare was signed in 1711 and the marriage of poet Sándor Petőfi to Júlia Szendrey was solemnized.
• Arefu — A village and commune in Argeș county, Romania, structurally located within the high mountainous zone of the Getic Subcarpathians along the Argeș river valley. The locality is of major historical and tourist importance, encompassing within its administrative territory the Vidraru Dam, the Argeș Gorges, Poenari Citadel (historically associated with Vlad the Impaler), and the southern starting sector of the famous Transfăgărășan alpine highway.
• Argedava — The name of an important Daco-Getic fortified dava or citadel, archaeologically located at Popești (Giurgiu county) on the banks of the Argeș river, considered by some historians to be the first capital of Burebista's kingdom. In a structural-archaeological sense, Argedava represented a major political, military, and commercial center, featuring a fortified acropolis, defensive earth ramparts, and craft workshops demonstrating tight economic ties with the Hellenistic world.
• Argolida — A historical region and administrative unit (prefecture) in the eastern part of the Peloponnese peninsula, Greece, recognized as one of the most important hubs of the Mycenaean civilization. In a structural-archaeological and geographical sense, Argolida encompasses monumental sites of universal importance, such as the fortified citadels of Mycenae and Tiryns, the legendary city of Argos, the ancient theater of Epidaurus, and is bordered to the south by the Argolic Gulf.