Sintra
Twenty-five kilometres northwest of Lisbon, 40 minutes by train from Rossio station. Sintra is a mountain town that Lord Byron called a glorious Eden. The draw is two palaces: Pena Palace (a Romantic castle in canary yellow and terracotta red, perched on a hilltop with views to the Atlantic) and Quinta da Regaleira (a Gothic mansion with initiation wells, underground tunnels, and Masonic symbolism). Plus the Moorish Castle, a 10th-century fortress with even better views than Pena. Sintra is the most popular day trip from Lisbon for a reason — it's extraordinary and it's easy to reach. But it's also crowded: Pena Palace gets 2 million visitors a year. If you go DIY, buy Pena tickets online at least 3 days ahead and arrive at opening time (9:30am). A guided tour skips the queues and includes transport between sites (the hill between town and Pena is steep — it's a 30-minute walk or a 4-euro tuk-tuk). I recommend the full-day tour that covers Pena, Regaleira, and Cabo da Roca (Europe's westernmost point).
- Choose this if Choose if you want Sintra's palaces plus Cascais coast in one day, with small-group pacing and no driving
- Skip if Skip if you dislike crowded palace interiors or want unhurried time at any single site