Explorers searched for Vilcabamba, the Inca Empire's final refuge, for decades. Gene Savoy identified ruins at Espíritu Pampa as the likely lost Inca capital. A BBC crew followed Savoy's trail, uncovering clues about the city's location. Roof tiles found at Espíritu Pampa linked the ruins to the last Inca capital. Peru's jungle still holds secrets of Vilcabamba, the Inca Empire's last stronghold.