Built in begin 17th-end 19th century, the oldest stone construction in Kharkiv and a monument of architecture of national significance. Ukrainian Baroque combined with Roman and Old-Russian motifs. Founded by the Cossacks, the Cathedral was erected in 1689 as part of the fortifications. The complex include: Ozeryanska church, 1896 designed as a basilica with high, narrow windows and its thick stone walls prove it was part of the city’s defensive fortifications, inside a copy of an miracle-working icon of Our Lady of Ozeriana what found in the Village of Ozeriana not far from Kharkiv in the mid-17th century; the Defense tower-bell tower, 1689; the Protection of the Virgin cathedral, 1689, in ukrainian baroque style; the Bishop's house, 1820-1826, classicism style; the Seminary, 1912. In the 18th century here was the home for Kharkiv College. Being an educational institution of Kiev-Mohyla Academy type, it trained students for religious and various secular activities. - The Eparch’s House(1826), now the diocesan administration, a complex with monks cells. - Part of it: