On the border of the Rhône river, the archaeological site of Saint-Romain-en-Gal is home to the Gallo-Roman remains of an ancient district of Vienne. Its museum recounts the ancient history of Vienne and boasts a magnificent collection of mosaics. Saint-Romain-en-Gal is one of the largest Gallo-Roman sites in France.
The classified site contains more than 3 hectares, where are located the remains of residential and commercial area built between 1st and 4th centuries AD.
First record of Kastelholma (or Kastelholm) castle is from the year 1388 in the contract of Queen Margaret I of Denmark, where a large portion of the inheritance of Bo Jonsson Grip was given to the queen. The heyday of the castle was in the 15th and 16th centuries when it was administrated by Danish and Swedish kings and stewards of the realms. Kastelhoma was expanded and enhanced several times.
In the end of 16th century castle was owned by the previous queen Catherine Jagellon (Stenbock), an enemy of the King of Sweden Eric XIV. King Eric conquered Kastelholma in 1599 and all defending officers were taken to Turku and executed. The castle was damaged under the siege and it took 30 years to renovate it.
In 1634 Åland was joined with the County of Åbo and Björneborg and Kastelholma lost its administrative status.