Urban spaces have different uses and different histories for the people who move through and use them. Those layered histories can enrich our understanding of spaces and provide common ground for collaboration and understanding for people... but only if we can make them visible. Timenesia allows people to annotate the spaces they live in, recording their stories and memories and attaching them to locations in a neighborhood. When you encounter a Timenesia mark, you can explore it via calling a toll-free phone number, by scanning a QR code, or by taking a tour using Google Maps or a custom smart phone application. After exploring memories and meanings of a specific place, you can add your reflections and annotations to the conversation. The system is in use in Dorchester, MA to offer tours of the Field's Corner neighborhood.