Real Sitio de San Lorenzo de El Escorial
Real Sitio de San Lorenzo de El Escorial - what a name! Located northwest of Madrid, the Royal Sight has functioned as a monastery, basilica, royal palace, pantheon, library, museum, university and hospital over the years. And believe me, no picture does it justice just how massive this place is. In fact, El Escorial is nothing less than the world's largest Renaissance building featuring one of the most beautiful libraries I have ever laid eyes on though unfortunately you aren't allowed to take pictures inside the complex.
Good to know:The Real Sitio de San Lorenzo de El Escorial is open daily from April to September between 10am and 8pm; between October to March it closes two hours prior and it may be closed on certain dates. Admission per adult is 10 euros. For more information, have a look here.