A closer look
Trekking along an ancient irrigation ditch sounds incredibly mundane until you realize it's clinging to the side of a sheer drop-off. The 'levadas' of Madeira are an epic 1,300-mile network of stone aqueducts built in the 16th century to funnel rainwater from the foggy mountains to the sunny agricultural coast. Today, tourists use the narrow maintenance walls as hiking trails, risking vertigo to walk straight through carved volcanic tunnels.





