Although the Sahara is the world's largest hot desert ... many of its short clay walls have stood for hundreds of years. In its medieval heyday, the town sat at the convergence of the Saharan ...

Some of the most gorgeous desert towns ... at the Sahara. Spanning a respectable 12 square miles, this sandy anomaly isn't ...

London, with a population of around 23,000 people in 1377, was the country’s largest medieval town.