Madrid, Spain Top 12 + Bonus: Smart City Guide from Gran Vía to Retiro Cuatro Torres Business Area Gran Vía Madrid travel guide Madrid walking tour Metro de Madrid tips Plaza Mayor Prado Museum Puerta del Sol Retiro Park Royal Palace Madrid +
Palace of Culture and Science (PKiN), Warsaw: Visiting the Observation Deck + Night & Day Walk Architecture City Walks Observation Deck Pałac Kultury i Nauki Palace of Culture and Science PKiN Poland Things to Do in Warsaw Viewing Terrace Warsaw Warsaw Guide Warsaw Skyline Warsaw Travel Winter in Warsaw +