The capital, founded in 1538, is the largest city and situated almost in the center of the country at an altitude of 2600m (8600ft). Bogotá reflects a blend of Colombian tradition and Spanish colonial influences. Many historical landmarks have been preserved, such as the Capitol Municipal Palace and the cathedral, the Capilla del Sangrario, on the main square, the Plaza Bolivar. Bogotá also contains the Gold Museum, with its unique collection of over 100,000 pre-Colombian artworks. Around 50km (32 miles) south of Bogotá lies Zipaquirá, an area well-known for its many salt mines, one of which contains the famous Salt Cathedral (capable of accommodating 8400 people). Guatavita, a two-hour bus drive from Bogotá, is best known for its Laguna de Guatavita, the ritual center and sacred lake of the Muisca Indians.