Part of the economy of the Sudetes is dedicated to tourism. Coal mining towns like Wałbrzych have re-oriented their economies towards tourism since the decline of mining in the 1980s. As of 2000 scholar Krzysztof R. Mazurski judged that the Sudetes, much like the Poland's Baltic coast and the Carpathians, were unlikely to attract much foreign tourism. Sandstone has been quarried in Sudetes during the 19th and 20th centuries. Likewise volcanic rock has also been quarried to such degree untouched volcanoes are scarce. Sandstone labyrinths have been a notable tourist attraction since the 19th century with considerable investments being done in projecting trails some of which involve rock engineering.