Uc Avlija Mausoleum, the mausoleum of the three holy men, is one of the smaller historic monuments inside Khiva's Itchan Kala. Its portal and dome give a compact example of the old city's religious architecture, probably dating from the 16th century.
It is not a headline sight like the minarets or palaces, but it rewards slow wandering through Khiva. Add it to a route through the eastern side of the walled city rather than treating it as a stand-alone destination.