"Once the hillside summer palace of the Spanish monarchs, the magnificent Palacio Real de La Granja is where the royals would retreat to go hunting or escape the heat. This is a must-see for all tourists—especially anyone obsessed with royals. There's lots to explore inside the palace, of course, but the manicured gardens, packed with statues and fountains, deserve some time, too. Buy tickets in advance to avoid the lines." - Ramsey Qubein