The most innovative feature of the ABBA Museum is a room dedicated to hit track 'Ring Ring', which features a 1970s-style telephone. The handset is connected to a working phone line and the only people who know the number are ABBA stars Agnetha Faltskog, Anni-Frid Lyngstad, Benny Andersson and Bjorn Ulvaeus, who will all call in occasionally to talk to visitors.
ABBA Museum

Andrea Petroni - Travel Blogger