Prague has the oldest trams in Europe. The no.22 goes up to the castle and does a picturesque touristy trail. On weekends and holidays route no.91 is taken over by the Nostalgic Tram, with historic trains that will whisk you off some of the city hotspots. They run from 5.00 a.m. until midnight; after that the night trams will kick into action. Use the same tickets as the bus and metro.