The stone is called Jerusalem stone - a kind of pale, golden limestone quarried from the hills nearby. It is so important that there is a city rule: every new building in Jerusalem must be faced with this same stone. So even modern shops and houses look as if they belong to the old streets.
The walls around the Old City are huge - about 12 metres tall and 4 kilometres long. You can walk most of the way around the top of them on a stone path. From up there you can see right across the rooftops of the city.
The lanes inside are narrow, twisty, and often go up or down steps because the whole city is built on hills. There are markets selling spices, sweets, fresh bread and craft things. The air smells of cardamom, mint tea and za'atar.
Some of the stones have been walked on so many times that they are smooth and shiny, like marble. Children running through the alleys today are walking the same routes that people walked thousands of years ago.