Karachi is located on the coast of the Arabian Sea. It is the largest city in Pakistan. Once a small fishing village in the early 19th century, the bustling port is now the country's center of commerce and industry. As Pakistan's most populous city, Karachi faces such problems as poverty, overcrowding and pollution. Still, Karachi is an amazing place. Colorful markets and bazaars show off local crafts. The Quaid-i-Azam Mausoleum (pictured), a monument to Pakistan's founder, Mohammad Ali Jinnah, provides peace from the lively city. (ROBERT HARDING WORLD IMAGERY/GETTY IMAGES)