Photo Courtesy Christina Pereira As mentioned earlier, Bergamo consists of the citta bassa, or low city, and the citta alta, the higher and older part of the city.
You can walk up, take a bus, or drive up - but the streets are very narrow in the old high city.
So, an alternative is to take the funicular, or "cog" railway. To climb up the tracks there is a toothed wheel under the train that helps the train crawl up and down the track.