Rupelmonde Castle was built by the Counts of Flanders in the 12th century directly opposite the mouth of the river Rupel into the Scheldt river to defend these rivers. It was a large fortress with 17 towers circled by a moat. From this castle toll was levied from passing ships. Later on the castle was also used as a state prison. This caused the castle to play a important role in the history of the region.
In 1678, when Spanish and Dutch troops were fighting against French troops, the castle was destroyed. The castle was never rebuilt and turned into a quarry for cheap building materials for the locals. In 1817 the castle ruins were demolished with exception of a base of a tower with some connecting wall fragments. On these remains then a tower out of red Tournai limestone was built by Baron De Feltz. This tower was used as a hunting pavilion.
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The stone church of Gamla Uppsala, built over the pagan temple, dates from the early 12th century. Due to fire and renovations, the present church is only a remnant of the original cathedral.
Before the arrival of Christianity in Sweden, Gamla Uppsala was the seat of Swedish kings and a ceremonial site known all over northern Europe. The settlement was home to royal palaces, a royal burial ground, and a great pagan temple. The Uppsala temple, which was described in detail by Adam of Bremen in the 1070s, housed wooden statues of the Norse gods Odin, Thor and Freyr. A golden chain hung across its gables and the inside was richly decorated with gold. The temple had priests, who sacrificed to the gods according to the needs of the people.
The first Christian cathedral was probably built in the 11th century, but finished in the 12th century. The stone building may have been preceded by a wooden church and probably by the large pagan temple.