When King Mindon Min founded Mandalay in 1857 he ordered the construction of a new Royal Palace. This was the last palace built by Burmese royals. The king located it in a square citadel surrounded by four 2km-long walls with a total of 48 turrets and 12 gates, one for each sign of the zodiac. http://tourism.gov.mm/en_US/attractions/destinations/mandalay/