Algeria opens the Tassili n'Ajjer's prehistoric rock paintings at the heart of the Sahara, the Roman ruins of Timgad and Djemila in the Atlas, and Algiers' white-blue Casbah cascading toward the Mediterranean.
Pleasant Mediterranean coast, Algiers Casbah walking comfortable, and Saharan excursions to Tassili and Hoggar still possible before summer heat.
Sahara hits 45°C and excursions suspend, but the Mediterranean coast stays pleasant and Algiers' Riadh El Feth gardens fill with summer cinema.
Saharan excursions resuming, Tassili n'Ajjer rock-art tracks accessible, and Constantine's UNESCO old city pleasant in cooler air.
Mild Mediterranean winter, Saharan night skies at peak clarity, and Algiers' Bardo museum and the Notre-Dame d'Afrique at their most pleasant.