Yemen

A highland mountain village perched on a narrow ridge at 2,200 meters, famous for its ancient dry-stone agricultural terraces, traditional hima communal land-management system, and basalt architecture adapted to the highland climate.

An 18th-century ZaydiImam's summer palace perched on a massive natural rock outcrop in Wadi Dahr, with the lower rooms carved directly into the natural stone and upper floors built in the Sana'ani tower-house style.

A medieval Islamic university town in the Tihama coastal plain, once the intellectual capital of the Yemeni ZaydiImamate, inscribed as a UNESCO World Heritage Site in 2000 and placed on the Danger List the same year.

A thousand-year-old walled city of multi-story tower houses and hand-carved gypsum facades, continuously inhabited since before the 10th century and inscribed as a World Heritage Site in 1986.

A walled city of eight-story mud-brick tower houses built on a coastal salt flat, often called the Manhattan of the Desert, continuously inhabited for at least five centuries.

A remote Indian Ocean archipelago with 37% plant endemism, famous for the dragon's blood tree and its otherworldly highland fog forests, inscribed as a UNESCO World Heritage Site in 2008.