There are also mountain groups of similar geological structure that spread over the River Piave to the east - Dolomiti d'Oltrepiave; and far away over the Adige River to the west - Dolomiti di Brenta (Western Dolomites). There is also another smaller group called Piccole Dolomiti (Little Dolomites) located between the provinces of Trentino, Verona and Vicenza (see the map).
One national park and many other regional parks are located in the Dolomites. In August 2009, the Dolomites were declared a natural heritage site by UNESCO.
During the First World War, the line between the Italian and Austro-Hungarian forces ran through the Dolomites. There are now open-air war museums at Cinque Torri (Five Towers) and Mount Lagazuoi. Many people visit the Dolomites to climb the Vie ferrate, protected paths created during the First World War. A number of long distance footpaths run across the Dolomites, which are called "Alte vie" (i.e., high paths). Such long trails, which are numbered from 1 to 8, require at least a week to be walked through and are served by numerous "Rifugi" (huts). The first and, perhaps, most renowned is the Alta Via 1.
A tourist mecca, the Dolomites are famous for skiing in the winter months and mountain climbing, hiking, climbing and Base Jumping, as well as paragliding and hang gliding in summer and late spring/early autumn. Free climbing has been a tradition in the Dolomites since 1887, when 17-year-old Georg Winkler soloed the first ascent of the pinnacle Die Vajolettürme.
The main centres include: Rocca Pietore alongside the Marmolada Glacier, which lies on the border of Trentino and Veneto, the small towns of Alleghe, Falcade, Auronzo, Cortina d'Ampezzo and the villages of Arabba, Urtijëi and San Martino di Castrozza, as well as the whole of the Fassa, Gardena and Badia valleys.