The city of Salta, capital of Salta Province, is reputed to have the best preserved colonial architecture in Argentina. The most significant buildings are grouped around the central square, including the Cathedral, the Cabildo (Town Hall) – which houses the Museo Histórico del Norte, the Museo Colonial and the Museo de Bellas Artes – and the Iglesia San Francisco. The province is well known for its spectacular train journey, el Tren a las Nubes (Train to the Clouds), which ascends the Quebrada del Toro and climbs up to the puna (plateau). The climax of the trip is the crossing of the la Polvorilla viaduct (4182m/13,716ft above sea level). Around 100km (63 miles) south of Salta, the Quebrada de Cafayete is a landscape of barren sandstone known for its distinctive formations, such as the Garganta de Diablo (Devil’s Throat). Surrounding Cafayete are many vineyards, which flourish in the warm, dry and sunny climate. Los Cardones National Park is known for its large cacti (cardó), reaching heights of up to 6m (20ft).