Thousands of years old and still standing strong: Inside the world's most formidable fortresses

Ancient fortresses stand as enduring monuments of strength and engineering. These structures were built to safeguard kingdoms and repel invading forces. Masada, Citadel of Aleppo, and Arg-e Bam showcase remarkable ancient architecture. Mycenae Citadel and Erebuni Fortress reveal insights into early civilizations. Acrocorinth demonstrates formidable natural defenses and strategic importance.