Sightseeing tours with red double deckers and mini trains to the main attractions in Oslo – all summer long! City Sightseeing hop on-hop off The classic sightseeing tour with red double deckers makes 17 stops by Oslo's main attractions, including Vigeland Sculpture Park, Akershus Fortress, the Opera House, Karl Johans gate, the Royal Palace and the museums at Bygdøy. Audio guide languages: Norwegian, English, German, French, Spanish, Italian, Japanese and Russian The ticket is valid for 24 hours of unlimited travel on the bus. Oslo City Train Sightseeing by mini train with stops at five central locations in the city centre. The train is available in the summer months of June, July and August, and is very popular with children! The ticket is valid for 24 hours of unlimited travel. Oslo City Card The complete sightseeing ticket: City Sightseeing hop on-hop off, Oslo City Train and entrance to a number of museums.