Castillo de Gigonza site has been in existence since antiquity. The present castle is of Andalusian origin and almost square in shape, with two parts to its structure. The current appearance dates from the 13th and 14th centuries. A narrow and low door contains a lintel with two heavy imposts. The upper floor is vaulted and contains windows. The grounds contain a surrounding fence. The courtyard is accessed through a door with and arch, displaying a coat of arms of the Casa de Arcos.
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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.