Construction works of the impressive church of Nuestra Señora de la Asunción began in the early 16th century. It was built on a former castle, the walls of which can still be appreciated in the main portal. Its nave is extraordinarily high and has a hall plan.
It is covered with ribbed vaults forming a star, which become even more intricate on their higher section, over the choir. Also worth mentioning is the access to the choir through a magnificent staircase with a stone handrail, covered with an oval vault in cut stone masonry and upper and lower doors decorated with pilasters. Its baptism font is a complete work of art; built on a ribbed column, it is covered in paneled decorations dating back to the 17th century. The main altarpiece is one of the most outstanding pieces of its kind in La Rioja region. It was built in the 16th century and gilded in the 17th century. A good number of the figures depicted narrate the life of Christ, his birth and childhood. There are also images of San Juan and Nuestra Señora del Rosario.
The Royal Palace was built in the first half of the 19th century as the Norwegian residence of King Charles III, who also reigned as king of Sweden and otherwise resided there, and is the official residence of the present Norwegian monarch. The crown prince resides at Skaugum in Asker west of Oslo. The palace has 173 rooms.
Until the completion of the Royal Palace, Norwegian royalty resided in Paleet, the magnificent town house in Christiania that the wealthy merchant Bernt Anker bequeathed to the State in 1805 to be used as a royal residence. During the last years of the union with Denmark it was used by the viceroys of Norway, and in 1814 by the first king of independent Norway, Christian Frederick.