The current Walloon economy is relatively diversified, although certain areas (especially around Charleroi and Liège) are still suffering from the steel industry crisis, with an unemployment rate of up to 30 percent. Nonetheless, Wallonia has some companies which are world leaders in their specialized fields, including armaments, glass production, lime and limestone production, cyclotrons and aviation parts. The south of Wallonia, bordering Luxembourg, benefits from its neighbour's economic prosperity, with many Belgians working on the other side of the border; they are often called "frontaliers". The Ardennes area south of the Meuse is a popular tourist destination for its nature and outdoor sports, in addition to its cultural heritage, with places such as Bastogne, Dinant, Durbuy, and the famous hot springs of Spa.