La Crête Abbey was a Cistercian monastery in the commune of Bourdons-sur-Rognon. It was founded in 1121 as the second daughter house of Morimond Abbey by Simon de Clefmont, after a failed attempt at a foundation in 1118 at the site now known as La Vieille-Crête. The abbey was very active in founding further monasteries: Les Vaux-en-Ornois in Saint-Joire (1130), Saint-Benoît-en-Woëvre (1132), Les Feuillants (1145) and Matallana in Villalba de los Alcores (1173).
It was suppressed during 1791 in the French Revolution, when the church and conventual buildings were mostly demolished. Little remains of the mediaeval structures, known from a plan of 1705, apart from the chapter house. The gate house of 1715 also survives.
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.