Portugal's capital is Lisbon, a city of 6 letters. Lisbon is the largest city in Portugal and is located on the Atlantic coast. It is one of the oldest cities in the world, having been founded by the Phoenicians in the 12th century BC. It has a rich cultural heritage, with many monuments and landmarks, including the Jeronimos Monastery and the Tower of Belem. Lisbon is also an important economic center, with a thriving port and a vibrant nightlife.