The ironworks in Kimo was founded by Petter Heijke in 1703. Petter Heijke chose the place because there was an enough deep harbour in Oravainen, waterpower and wood for making charcoal. The ore was brought from Utö in the southern Baltic sea and from Herräng mines in Roslagen. In Kimo it was forged into iron-pigs. The iron-pigs were then tranported further up the river to the forges in Kimo where it was refined into iron-bars.
Kimo was acquired by captain Lars Magnus Björkman in 1818. He renewed ironworks strongly and built for example a lighthouse to the Stubben island. Iron manufacturing ended in 1890s and the factory site started textile business. The heyday of textile manufacturing in Oravainen was in 1920s-1930s.
The original ironworks site and buildings are well-preserved. Today the Kimo Ironworks includes three hammersmith´s workshops: the Lower Mill, the Middle Mill and the Upper Mill. The Lower Mill is the centre of the museum exhibiting the the iron manufacturing. The museum and art gallery are open on order or when there are events arranged on the site. There are also a café and restaurant. Several events are arranged in the ironworks area during the summer season.
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.