World Heritage Sites: Benin (with Pictures)

Given the picture, name the UNESCO World Heritage Site. Each row contains up to 4 pictures of the same site. How hard could it be? All images are sourced from whc.unesco.org and Wikipedia under a Creative Commons license. © CRA-terre / Ensag, UNESCO, Sebastien Moriset, Hamissou Halilou Malam Garba, Parc National d'Arly, DPNP.