Embark on your own Age of Discovery. The Age of Discovery first began in the 15th century in Lisbon. Naturally, it's also the perfect place to begin your own journey! Start with the city's Monument to the Explorers before discovering the fantastic shoreline and many fashionable boulevards. From Lisbon, you'll set off for wonderful Porto, the country's second largest city, and the gateway to the beautiful Douro Valley. You can look forward to splendid days cruising this truly timeless waterway, visiting the vineyards and discovering the region's fascinating history.