FRANCE // A jagged finger of rock rising above glaciers, snowfields and icy crags of the mighty Mont Blanc massif, Aiguille du Midi (3842m/ 12,604ft) is a geographical beacon. The panorama of the French, Swiss and Italian Alps from the summit is breathtaking, especially when peering down through the aptly named Step into the Void's glass floor. Year-round, you can float up in a cable car from the ski-resort town of Chamonix on the vertiginous Téléphérique de 'Aiguille du Midi. The dizzying views don't end here: between late May and September, you can continue in the Télécabine Panoramique Mont Blanc to Pointe Helbronner (3466m/11,371ft) on the France-Italy border, then another 4km (2.5 miles) in the SkyWay Monte Bianco cable car to Courmayeur, on the Italian side of the mountain.