Burned by the Germans during World War II, Kalambaka has only one building of interest, the centuries-old cathedral church of the Dormition of the Virgin. Patriarchal documents in the outer narthex indicate that it was built in the first half of the 12th century by Emperor Manuel Comnenos, but some believe it was founded as early as the 7th century, on the site of a temple of Apollo (classical drums and other fragments are incorporated into the walls, and mosaics can be glimpsed under the present floor). The latter theory explains the church's paleo-Christian features, including its center-aisle ambo (great marble pulpit), which is usually to the right of the sanctuary; its rare synthronon (four semicircular steps where the priest sat when not officiating) east of the altar; and its Roman-basilica style, originally adapted to Christian use and unusual for the 12th century. The church has vivid 16th-century frescoes, work of the Cretan monk Neophytos, son of the famous hagiographer Theophanes. The marble baldachin in the sanctuary, decorated with crosses and stylized grapes, probably predates the 11th century.