1. Sintra, Portugal Sintra, Portugal, is a popular day trip destination from Lisbon due to its close proximity and the abundance of beautiful attractions. The town is known for its stunning architecture, lush gardens, and historical palaces that offer visitors a glimpse into Portugal’s rich past. The Sintra National Palace, with its distinctive conical chimneys, showcases a blend of Moorish and Manueline architectural styles and provides insight into the country’s royal history.