Located in the Greater Lisbon area along the Portuguese River, Sintra is a city of about 400,000 residents that’s particularly well-known for its abundant castles and palaces. For those staying in Lisbon looking for a convenient day trip option, Sintra is usually no more than an hour away, depending on traffic, which is often bumper-to-bumper during rush hour and other peak travel times. Sintra is one of the country’s architectural wonders and is also known for its friendly people, vibrant food and art scenes, and stunning natural beauty.