Austrias second-city is Graz. It stands in the southeast of the country on the Mur River, a tributary of the Danube. Visitors with a hire car in Graz can explore this green and forested region. The highlights of the Graz area include the huge Lurgrotte cave complex, the vineyards of Steirische wine country and the spa region to the east of the city. Look out to for Riegersburg Castle, an impressive medieval castle perched on the 1000ft-summit of an old volcano, the farms where famous Lipizzaner horses are bred in the Piber area and Stubings huge national rural life museum.