Yemen

Capital: Sanaa

Socotra has 835 known vascular plant species, and about 37% of them are endemic, meaning they grow only there.
Shibam is built of mudbrick, and some of its tower-houses reach eleven stories. UNESCO listed it in 1982.
Sanaa's Old City has tower houses of stone or fired brick, up to eight stories tall, with plaster-decorated doors and windows. UNESCO listed it in 1986.
The dragon's blood tree, Dracaena cinnabari, is the famous tree of Socotra. The Diksam Plateau holds the island's highest concentration of these trees.

Cities