Unprogrammed spaces provide rich potential for the crowded and complex cities that are difficult to manage. The urban fabric becomes vibrant and lively when exposed to dense activities of occupants and citizens. Unprogrammed space does not mean necessarily a space left empty for flexible uses, but rather that it can be transformed and improvised by the users. It is self-organizing and variable. Galata Bridge Museum and Mecidiyeköy Pavillion are both urban generators with different scales and purposes. One transforms a seaside park and a vacant bridge in a historical neighbourhood, while other one creates a focus point as a temporary structure at the most crowded intersection of the city.