In Prague they have a different kind of sightseeing transport. It is called tram 91. The line operates on Saturdays, Sundays and public holidays from the 22nd March until 17th November.
It departures from termini from 12.00 to 17.35 hrs always on the hour. The tram makes a trip through Prague with a few stops and gives a nice impression of Prague. There is also a possibility to buy a drink or have a small snack on board of the tram.
For more information go to the Prague Tram site.
For more information go to the Prague Tram site.