Welcome to El Salvador, home to the best prisons and the worldâs most fortress-like prison, CECOT. ððļðŧ .. Worst of the Worst: Go inside El Salvadorâs prisons, including Nayib Bukeleâs CECOT (featured in the previous episode), where the most evil are kept. After visiting CECOT, we explored another prison that looks like a factory and even visited a notorious former neighborhoodâonce the most dangerous in Latin America.