St. Catherine's church is an old pilgrimage church. Its core dates from around 1400, whilst its masonry portico and frescoes date from the beginning of the 16th century. Presbytery from the 17th century, was renovated in the Baroque style in the 18th century. It has a Baroque altar, and the remains of fortified walls can be seen.
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.