One of the youngest towns in Sweden, Flen only gained its town charter in 1949. it is the surrounding area with the same name which offers the attraction.

On Lake Valdemaren, just east of the town, lies Stenhammar’s beautiful castle, renowned as the residence of Prince Vilhelm in the early 1900s. The castle is now used by Carl XVI Gustav and is not open to the public. Northeast of Flen is the prime minister’s summer residence, Harpsund, where the gardens are open to visitors. The old regimental town of Malmkoping has Malmahed, a former military site, now a museum and nature centre.

There are several military museums, as well as Museisparvagen, displaying veteran trams and other public transport vehicles. Visitors can enjoy a short tram ride through the countryside.