The nation's capital, Ljubljana, has many important Baroque and Art Nouveau buildings, with several important works of the native born architect Jože Plečnik. Other attractions include the Julian Alps with picturesque Lake Bled and the Soča Valley, as well as the nation's highest peak, Mount Triglav. Perhaps even better known is the Karst Plateau in the Slovenian Littoral. More than 28 million visitors have visited Postojna Cave, while a 15-minute ride from it are Škocjan Caves, a UNESCO World Heritage Site. Several other caves are open to public, including Vilenica Cave.