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:The Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne's court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.