So-called Jätinkirkko (“the giant’s church”) of Kastelli is a rectangular stone rampart measuring 36 x 62 meters. It dates back to the Stone Age and is one of the most significant ancient structures in Finland. The fort was probably built between 2700-2200 B.C like most of the stone constructions in northern Botnia.
The structure is located at top of the hill. The rampart, which is two meters high in its present state, has six gateways. In the environs are more than twenty rock cairns, a representative group of ten trapping holes and a stone age dwelling site lower on the slope.
Kastelli represents the earliest monumental construction in Finland in a form which is rarely found in hunter-catherer cultures. National Board of Antiques has submitted Kastelli site to the UNESCO Tentative List of World Heritage Sites.
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.