Yemen's ancient mud-brick skyscraper cities

What happened before and after this story. Background events not previously covered were summarised by AI.

1. 1 Dec 1982Background

   Old City of Shibam added to UNESCO World Heritage List

   UNESCO inscribed the walled city of Shibam in Yemen's Hadramawt, known for its mud-brick tower houses, as a World Heritage Site in 1982.

2. 1 Dec 1986Background

   Old City of Sana'a inscribed on the UNESCO World Heritage List

   In December 1986 UNESCO listed Sana'a's Old City, famed for its multi-storey mud-brick and rammed-earth tower houses, as a World Heritage Site.

3. 

   9 Nov

   Yemen's mud-brick towers: 30 metres tall and built 300–500 years ago

   Some of Yemen's mud towers rise about 30 metres and were built 300 to 500 years ago. Here's why people built up, not out, in the desert.