Ruttenstein Castle was first time documented in 1209, in a deed issued by Duke Leopold for the Baumgartenberg Monastery, where it is mentioned under the name Rotenstein. The existing structure of the high castle, however, suggests that the castle is significantly older. The construction period likely falls in the first half of the 12th century, although this is not documented. It is probably a foundation of the Counts of Clam-Velburg.
The walls of the formerly massive pentagonal keep are now only partially preserved, tapering to a point and visibly towering over the site. The former residential wing in the west retains three of its walls. Above them, a viewing platform has been constructed, accessible via wooden stairs. Clearly recognizable, though also only partially preserved, is the early Gothic castle chapel located near the stone steps to the residential building. The main castle itself was protected on the north, south, and east by a mighty ring wall, which is still partially preserved today, and from which seven wall towers protruded.
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.