Strasbourg is the largest city in Alsace in terms of area and population. It is also home to the European Parliament and many universities, making it a cosmopolitan and lively city.
It is also famous for its Notre Dame cathedral which has only one tower, its Petite France district (with half-timbered houses, small cobbled streets and a quay along the Ill), the Grande Ile in the historic center (listed as a UNESCO World Heritage Site) or the Neustadt district (“new town” built at the end of the 19th, beginning of the 20th century).
Strasbourg is only 1 hour and 20 minutes from Mulhouse by car or 1 hour by TER. Easily visited on foot or by streetcar, it is a perfect opportunity for a day trip.