Though surrounded by Boston, the 300-year-old town of Brookline is its own city. At the border of Brookline and Brighton—a neighborhood of Boston—you can see that each town seems not to take account of the other, at least with regard to fire hydrant placement (hydrants usually are more than just ten feet apart).

From what I’ve observed these hydrants’ colors are characteristic of their respective cities (Brighton/Boston on the left). Here they guard the DMZ, daring each other’s fire department to save a burning building in the wrong municipality.