During the High Middle Ages the area around Oberurnen was owned by Schänis Abbey and paid taxes to Säckingen Abbey. In 1264 the Habsburgs inherited the bailiwick of Glarus from the Counts of Kyburg. About two decades later, in 1288, Säckingen Abbey granted them a fief over the abbey's lands as well. To consolidate their control over Glarus, the Habsburgs built Näfels Castle and probably also built or expanded Vorburg. By about 1300 the castle was a Habsburg administrative center. In the mid-14th century it was the residence of the Austrian Habsburg Vogt Hermann von Landenberg. In 1351 Glarus rebelled against the Habsburgs and attacked and destroyed Näfels Castle. They may have also attacked Vorburg, though there are no surviving records of the this. The castle was probably expanded after the destruction of Näfels, either by the Habsburgs or Glarus. In 1369 it appears in a document when a Rudolf Stucki pledged the castle as collateral. In 1386 it was mentioned as a refuge castle and was probably not regularly inhabited. In the 15th century it was abandoned and fell into ruin. Many of the stones show evidence of a large fire in the castle, but whether it was an accident or due to an attack is unknown.
The north west wall of the tower was repaired and preserved during the 19th century. In 1940 the south ring wall was excavated and stabilized. An archeological excavation in 1970 discovered traces of an outbuilding as well as a layer of animal bones.
The ruins sit on a hill north of the village of Oberurnen. The palas was a rectangle of 18 m × 21 m with walls that are about 2 m thick. The walls are made of roughly finished and squared limestone blocks with more carefully finished bossage stones at the corners. A newer wall connects the palas with a residential wing on the eastern side. South and west of the palas, a narrow zwinger and two ditches protected the castle. Traces of the foundations of a bridge over the north side of the inner ditch are still visible. The gatehouse was probably on the north side of the ring wall. The palas was probably built at the end of the 13th century, while the ring wall, zwinger and other out buildings are from the early 14th.References:
The Church of Saint Demetrius, or Hagios Demetrios, is the main sanctuary dedicated to Saint Demetrius, the patron saint of Thessaloniki. It is part of the site Palaeochristian and Byzantine Monuments of Thessaloniki on the list of World Heritage Sites by UNESCO since 1988.
The first church on the spot was constructed in the early 4th century AD, replacing a Roman bath. A century later, a prefect named Leontios replaced the small oratory with a larger, three-aisled basilica. Repeatedly gutted by fires, the church eventually was reconstructed as a five-aisled basilica in 629–634. This was the surviving form of the church much as it is today. The most important shrine in the city, it was probably larger than the local cathedral. The historic location of the latter is now unknown.
The church had an unusual shrine called the ciborium, a hexagonal, roofed structure at one side of the nave. It was made of or covered with silver. The structure had doors and inside was a couch or bed. Unusually, it did not hold any physical relics of the saint. The ciborium seems to have been a symbolic tomb. It was rebuilt at least once.
The basilica is famous for six extant mosaic panels, dated to the period between the latest reconstruction and the inauguration of the Byzantine Iconoclasm in 730. These mosaics depict St. Demetrius with officials responsible for the restoration of the church (called the founders, ktetors) and with children. An inscription below one of the images glorifies heaven for saving the people of Thessalonica from a pagan Slavic raid in 615.
Thessaloniki became part of the Ottoman Empire in 1430. About 60 years later, during the reign of Bayezid II, the church was converted into a mosque, known as the Kasımiye Camii after the local Ottoman mayor, Cezeri Kasım Pasha. The symbolic tomb however was kept open for Christian veneration. Other magnificent mosaics, recorded as covering the church interior, were lost either during the four centuries when it functioned as a mosque (1493–1912) or in the Great Thessaloniki Fire of 1917 that destroyed much of the city. It also destroyed the roof and upper walls of the church. Black-and-white photographs and good watercolour versions give an idea of the early Byzantine craftsmanship lost during the fire.
Following the Great Fire of 1917, it took decades to restore the church. Tombstones from the city"s Jewish cemetery - destroyed by the Greek and Nazi German authorities - were used as building materials in these restoration efforts in the 1940s. Archeological excavations conducted in the 1930s and 1940s revealed interesting artifacts that may be seen in a museum situated inside the church"s crypt. The excavations also uncovered the ruins of a Roman bath, where St. Demetrius was said to have been held prisoner and executed. A Roman well was also discovered. Scholars believe this is where soldiers dropped the body of St. Demetrius after his execution. After restoration, the church was reconsecrated in 1949.