I planned to stay in Madrid for 3 days, before flying back to Hong Kong. The hostel I booked was in central area, so I can go any places easily by walking. I spoke to the host with my kindergarten level Spanish. He was so patient to tell me things to do in Madrid, like Parque del Buen Retiro, Museco Centro de Arte Reina Sofía, Mercado de San Miguel, Museo del Prado. (don’t forget to check a free entrance in Museo del Prado after 6pm!). Of course Plaza Mayor, the most iconic picture you could see from every postcard.