The city of Sion is the capital of the Swiss canton of Valais and is often referred to as the most ‘sun blessed’ city in Switzerland. Sion is instantly recognisable by the high towers of the Castle of Valeria and Castle Tourbillon. Hiring a car in Sion lets you travel to the Barrage de la Grande Dixence, a 285m high dam which takes 45 minutes to hike to the top of. There is also the opportunity to take the cable car ride if you don’t fancy the walk.