An ancient walled town

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Q1: What was the wall used for in the past - and what is its importance today?

[Answer]

Mountain passes hold the key to travelling among mountains. If you build a town in a pass, then you can make money by trading with travellers.

But, of course, a pass was therefore an important place and armies would try to capture it.

Glurns, in the Italian Alps, shows you what a walled town was like in the past and what it's like today.