Great Mosque of Agadez built
1515 CE.
Shown on the map at 16.974°, 7.988°.
Agadez Mosque (French: Mosquée d'Agadez) is a prominent mosque in Agadez, Tchirozerine Department, Niger. It was made of clay and is the tallest mud-brick structure in the world. The Agadez mosque is the most prominent religious center located in the central part of the Republic of the Niger, and has been a place of worship for centuries. The mosque hosts thousands of Muslims for Friday's prayers. Every year, Muslims travel long distance to visit the mosque for tourism and spiritual purposes.
Text from the Wikipedia article Agadez Mosque, licensed CC BY-SA 4.0.