Justino’s have produced a set of pictures taking a tour of the vineyards of Madeira.

Much of Madeira is irrigated by levadas, man made irrigation channels that hug the contours of the hillsides and irrigate the vineyards and farmland. Many are walkable as well.
It is not easy to visit the Justino’s winery as it is some distance from Funchal, but their wines are widely available in Funchal and Perhola retailer in Funchal has an excellent range of Justino’s wines to try and buy.
Justino’s are the largest producer of Madeira wines and make a superb 10 year old Sercial which is a firm favorite of mine. They also produce excellent table wines under the Colombo label.