The original church was erected in 1150 over a roman temple build in honor of the goddess Cybele, the mother-God. Three times destroyed, three times has been rebuilt.
In 1363, a fire completely destroyed the church. In 1600 it was partially destroyed in a cyclone before succumbing to the earthquake in 1755. Queen Maria I of Portugal, in 1783 ordered to rebuild the church again.
The Vestibule of this church, in manueline style is considered one of the workmanships of its time.
Bouillon Castle was mentioned first in 988, but there has been a castle on the same site for a much longer time. The castle is situated on a rocky spur of land within a sharp bend of the Semois River.
In 1082, Bouillon Castle was inherited by Godfrey of Bouillon, who sold it to Otbert, Bishop of Liège in order to finance the First Crusade. The castle was later fitted for heavy artillery by Vauban, Louis XIV's military architect in the late 17th century.
The castle is entered over three drawbridges. The main courtyard then leads to the ducal palace with its 13th century Salle Godefroy de Bouillon. From there visitors climb up to the top of the 16th century Tour d’Autriche for a breathtaking panorama of the town and river, before they way back via the torture chamber, citerns and dungeons, and past the 65m deep well Shaft.