The exact history of the Wolfenstein Castle is unclear. The archaeological excavations have dated the construction to the mid-12th century. The first written document dates from 1283 when Gottfried von Sulzbürg changed his name Wolfenstein and started the nobility. Hans von Wolfenstein died childless in 1462 and the castle was moved to the possession of Bohemian (Czech) king. Wolfstein lost its importance in the 16th century after been damaged in War of the Succession of Landshut in 1504. The castle was abandoned and fell into disrepair.
Today, the ruins of Wolfenstein are in good condition. It went through extensive excavations and renovations in the 1990s.
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.