The citadel of Bam, Iran, or Arg-é Bam, in Kerman Province, Iran is the world’s largest adobe structure, dating to at least 500 BCE. Credit: Ales.kocourek via Wikimedia Commons CC BY-SA 3.0

The citadel of Bam, Iran, or Arg-é Bam, in Kerman Province, Iran is the world's largest adobe structure, dating to at least 500 BCE. Credit: Ales.kocourek via Wikimedia Commons CC BY-SA 3.0

The citadel of Bam, Iran, or Arg-é Bam, in Kerman Province, Iran is the world’s largest adobe structure, dating to at least 500 BCE. Credit: Ales.kocourek via Wikimedia Commons CC BY-SA 3.0

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