Jerba's main draw beyond its beaches is the improbable density of history on this small, flat island. The ancient synagogue at Er Riadh, the Ottoman fortress at Houmt Souk, and the pottery caves at Guellala in the south are the highlights — and the medina of Houmt Souk itself repays an afternoon of aimless wandering. The village of Er Riadh has added a more recent layer: an outdoor gallery of murals that has become one of the most visited street art destinations in the Arab world.