Ark-Citadel is a residence of Bukhara khans. According to the last excavations, it was determined the citadel was on this place from 4 century BC. For many years of building and destruction, 20 meters height artificial hill was formed; its upper layers were built over in the time of last bokharan emirs. The wooden part of Ark building was burnt down during the fire of 1920. The general planning is being re-established by historical documents. Ark included the whole city, consisting of closely accreted houses; courts and yards with state institutions, emir, his wives, and relatives and officials lodgings. Inside the trapeziform outlines of citadel walls the planning was right-angled with traditional cruciform crossing of main streets.
