Many years ago Registan Square was occupied by numerous beautiful buildings. Today there is only one monument of medieval Bukhara—Bolo-Hauz Ensemble. It is a classic sample of Central Asian mosque: the winter building of 1712, summer aivan of the early 20th century with ornamented ceiling and wooden columns, small basin and small minaret constructed in 1917 by usto Shirin. The brightest feature of the mosque is a decor of the avian, columns of which are made of two joined trunks each and have stalactite capitals.