Berlin hop-on hop-off tour allows you to hop-on and off as many times as you like aboard open top double decker buses. There are 20 stops around Berlin, and buses departs every 10 minutes in Summer or 15 minutes in Winter. The continuous route without hopping-off is approx. 2.5 hours and a guided commentary in 13 languages is available. Tickets are valid for 48 hours from first use. Many must-see Berlin attractions are easily accessible enroute including Checkpoint Charlie, Berliner Dom (Cathedral), Pergamon Museum, Brandenburg Gate and the enchanting Charlottenburg Palace.