The Pena Palace could be straight out of a children’s fairy tale book, with its setting atop a mountain peak and multicoloured towers. It is the most iconic landmark in Sintra and one of the first places many tourists make a beeline for. It was designed by Portugal’s King Fernando II and reflects 19th-century Romanesque Revival architecture. It’s easy to plan a visit since the doors are open from 9:30am to 8:00pm and tickets cost €14 for adults (€12 for children), which includes a walk through the elaborate interiors. The Palace was categorized as a UNESCO World Heritage Site in the 1990s.