The fortress that lies at the heart of Bukhara dates back 2,000 years. It was the home of the emirs who ruled over this great city on the Silk Road. Inside its mud-brick walls lie beautiful mosques, former ceremonial rooms, and the remains of the harem.
The Ark of Bukhara is a massive fortress located in the city of Bukhara, Uzbekistan, that was initially built and occupied around the 5th century AD. Wikipedia