St. Simeon’s and St. Anna’s Orthodox Cathedral was designed by architect N. Chagin and built during 1890-1892, with the financial support of Russian Czar Alexander III. The altar and foundation remained from the previous church which was built in 1774 after the design of architect F.B. Rastrelli. It was devastated in WWII and renovated between 1993 and 2003.
References:House of the Blackheads (Melngalvju nams) is a building situated in the old town of Riga. The original building was erected during the first third of the 14th century for the Brotherhood of Blackheads, a guild for unmarried German merchants in Riga. Major works were done in the years 1580 and 1886, adding most of the ornaments.
The structure was bombed to a ruin by the Germans June 28, 1941 and the remains demolished by the Soviets in 1948. The current reconstruction was erected from 1995 to 1999. Today the House of Blackheads serves as a museum and sometimes concert hall.