On the western side of Madrid, just below the royal palace, is a typical-looking European train station, but inside it’s not. The Estacion de Principe Pio was remodeled to incorporate all the metro and commuter rail stations, stacked up on top of each other like a toy train set, with trains criss-crossing above and below you in all directions. Some of the tracks seem dormant, then all of a sudden a train comes shooting through. Definitely recommend killing a while here just taking it all in. I was like a kid in a candy… er, train store.