Vesuvius is the only active volcano on mainland Europe — and 3 MILLION people live within its evacuation zone. The last eruption: 1944 (destroyed San Sebastiano al Vesuvio, damaged 88 B-25 bombers at Pompeii airfield). The 79 AD eruption: buried Pompeii, Herculaneum, Oplontis, Stabiae — 16,000+ dead in 24 hours. You can WALK to the crater rim (1,281m) in 30 minutes from the parking area, look INTO the 300m-deep crater, smell the sulfur, see the fumaroles, and understand — viscerally, physically — what 3 million people live with every day.
The route: Drive or bus to the parking area (1,000m altitude). Walk the paved/gravel path to the crater rim (1,281m) — 30 minutes, 200m elevation gain. Moderate — steep in sections but short. The path zigzags up the cone through lava flows from 1944 and earlier eruptions. At the top: The crater — 300m deep, 600m wide. Steam rises from fumaroles on the inner walls. The rocks are warm to the touch. The smell of sulfur is constant. The Bay of Naples is below you — Naples, Capri, Ischia, Procida, the Sorrento peninsula. The view and the danger occupy the same space.
From Naples: Circumvesuviana train to Ercolano Scavi (20 min, €2.20) + Vesuvio Express bus to parking area (€10 return, 20 min). Or car via A3 + exit Torre del Greco → signs to Vesuvio. Entry: €10 (crater path). Guide optional but informative (€15-20). Open 9am-3pm (winter) to 9am-6pm (summer). Combine with Pompeii (30 min from Vesuvius base): Morning volcano → afternoon ruins. Or Herculaneum (more intact than Pompeii, less crowded). Volcanoes → · Naples day trips →