Most people do not think of looking for geology from the sidewalks they travel, but for the intrepid geologist any good rock can tell a fascinating story. On this virtual tour, which incorporates illustrations and photographs, you will explore a range of rocks equal to any assembled by plate tectonics, such as: — 3.5-billion-year-old gneiss and 120,000-year-old Italian travertine; — a fossil-rich limestone that is the most commonly used building stone in the US; — and the granite that led to the construction of the first commercial railroad in America. In this virtual exploration of building stone from across the United States and Italy, I discuss history, transportation, and architecture to give you a new way to appreciate urban geology. Plus, we’ll even “visit” a couple of quarries and see where the stone originates.