|FRIDAY, APRIL 6, 2007. MEDELLIN, COLOMBIA. With over 2.2 million people, Medellin is Colombia's second largest city after Bogota and the capital of Antioquia province. It is located in the wide Aburra Valley in the Central Cordillera at an elevation of about 1400 meters. Medellin is infamously known for the Medellin cartel and its former leader, Pablo Escobar (Escobar was killed by the Colombian government in 1993 after escaping from prison). When Escobar was in charge, Medellin was the cocaine capital of Colombia. Medellin is a modern city with little remaining colonial architecture. It has a modern center, with wealthy suburbs and slum barrios built into the hills above. Colombia's only mass trassit metro system opened in 1995. The system is at ground level outside and elevated within the city center. With over a half dozen colleges and universities, Medellin is Colombia's university city. The student population is quite evident when walking the streets. Lacking colonial architecture, Medellin's main tourist attractions are its museums.