ZIMBABWE // Clamber over ancient boulders and ruins, explore narrow crevices and ponder the significance of the greatest medieval city in sub-Saharan Africa, Great Zimbabwe. Dating to the 11th century, this World Heritage-listed site was likely built by ancestors of the modern Shona people as a monarch's palace, surrounded by high, mortarless stone walls. It's best visited at sunrise or sunset when the light gives an other-worldly feel to the landscape.