—What To Expect—The National Palace of Sintra in the heart of the old town has been a UNESCO World Heritage site since 1995. Walk the stomping ground of the Portuguese monarchs and see how they lived in the middle ages. Visit the Coats of Arms room and see the most important collection of Mudéjar Azulejos (colored glazed tiles) in the world! With its thousand-year history, you'll feel the atmosphere as soon as you step inside the National Palace of Sintra. See the stunning architecture and the giant 33-meter high chimneys, built in the 14th century to keep the kitchens free from smoke.