Museo del Prado
A cultural buffet of works by Goya, Velasquez, Titian, and Rubens are all housed at the Prado Museum. With a staggering collection of 7,600 paintings and 1000 sculptures, you'd need a couple of hours to fully immerse yourself in what the museum has to offer. Add a couple of hours more waiting in line and you'd basically need a day, but that's nothing for the true lover of art. After all, this is where you'll find the largest and finest collection of European art.