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Photo: Arad Mojtahedi, CC BY-SA 3.0 via Wikimedia Commons
This ancient citadel has a history dating back around 2000 years, to the Parthian dynasty (248 BC–224 AD), but most buildings were built during the Safavid dynasty. The city was largely abandoned due to an Afghan invasion in 1722, which ended Safavid rule. This site suffered badly along with the rest of the city during the 2003 earthquake. During the aftermath, some 80 percent of the citadel was shattered and the monument lay in ruins. As a World Heritage site; countries like Japan, Italy, France and more have stepped up and contributed several million dollars towards its reconstruction. Teams of western scientists have been working with Iran, using 3D mapping equipment in an effort to restore this monument to its former glory. Today it's open for tourism, but your explorations will be restricted to a small set of approved paths.
The Arg-e Bam, located in the city of Bam, Kerman province of southeastern Iran, is the largest adobe building in the world. The entire building was a large fortress containing the citadel, but because the citadel dominates the ruins, the entire fortress is now named Bam Citadel.
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