The first electric trams in Lisbon started running in 1901, when most people still used horses and carts. Some of the trams running today are nearly that old. The little wooden carriages are called 'remodelados' - which means 'remodelled' - and they still have the original wooden seats, brass handles and bells you ring with a string.
Tram 28 is the most famous of all. It winds through the oldest parts of the city, squeezing through alleys so narrow that you could almost reach out of the window and touch someone's washing on a balcony. It climbs hills steeper than most rollercoasters. The driver uses a hand brake - a big wheel they turn very fast - to slow it down on the way back.
When the road gets too steep even for a tram, Lisbon has a different solution: funiculars. These are tiny tram-like cars on rails that pull each other up the hill - one goes up while the other comes down, like a giant see-saw. The Ascensor da Gl贸ria is the most famous one, opened in 1885.
Today, the trams are protected because they are part of what makes Lisbon Lisbon. They have their own museum and their own group of mechanics who only work on them. Many of the drivers have done the job for their whole lives, and know every corner of the city by heart.