The Salt Cathedral - the first wonder of Colombia - is a Roman Catholic church built in the tunnels of a salt mine in a mountain about 30 miles (50 km) from Bogota. It is located 2,552 meters above sea level and 600 feet (180 m) under ground. The guided tour lasts about four hours. You can take an organized half-day trip or public transportation via the Transmilenio to Portal Norte station and then the intercity bus to Zipaquira.