Featuring limestone cliffs, cave systems (the largest of which—the Hundidero-Gato complex —has prehistoric origins), and deep gorges, it’s no wonder that Sierra de Grazalema is considered to be one of Spain’s most stunning ecological landscapes. Budding botanists can lose themselves in more than 1,300 different species of flora, while birders will delight in the prospect of seeing communities of Bonelli’s eagles and the endangered Egyptian vulture. More into mammals? The UNESCO Biosphere Reserve is also home to genets, mountain goats, and otters