Taken from Wikimedia Commons.
The citadel and old city of Bam in Iran has been inhabited since the time of the Parthian Empire, which was between 247 B.C.E to 224 C.E. However, the city became an important stop on the silk and cotton trade route, specialising in garments sewn from the imported textiles during the 7th to 11th century C.E.
Bam has been placed on the UNESCO World Heritage list as being one of the best fortified city and citadel built with layers of mud and mud bricks. It is also an oasis area of the Kerman Province with underground irrigation pipes that can be dated from the time of original settlement.
Unfortunately in 2003 there was a major earthquake that severely damaged the old city and citadel.
Taken from Wikimedia Commons.
Since 2004 UNESCO and the Iranian Government have had a reconstruction plan in place to rebuild the city using traditional techniques with only a few modern additions.