In ancient Iran there were many types of public
structures, from among which one may mention the
achievement represented by city walls. The twelfth to
fourteenth century walls of Yazd, which are still
standing, are perhaps the most interesting, imposing and
skillfully planned. In Yazd, sections of the old walls and
moat remain, providing an interesting example of a
medieval wall, fortified by moat, towers and barbicans,
now buried deep within a town which has long since
expanded beyond its old limits.
These walls were begun, it is said, in 1119 and rebuilt
and extended during the 14th century. In places, they were
15 meters high, being nicely decorated with ornamental
devices such as those employed on unglazed pottery.