One of the great pleasures of exploring a hilly city is a constantly changing, often surprising, landscape. One minute you are trudging along a crowded sidewalk, huffing and puffing up a big hill, and suddenly you glimpse it between buildings: the Bosphorus. The Acropolis. The Prague Castle. Today’s Photo of the Day from San Francisco reminded me of the moment of magic. From out of the shadows of Russian Hill, Flickr user Nan Palmero shows us the magnificent Golden Gate Bridge and the city spread out before you. It’s a good chance to stop, catch your breath, take a photo and keep on trucking until the next overlook – hopefully with a refreshing beverage nearby too.