It’s difficult to pinpoint exactly when our street art obsession began. But New York City has been the ultimate enabler, feeding our addiction from a well that never seems to run dry. Alas, junkies are never satisfied. Our appetites grew, and pretty soon we found ourselves down deserted alleys in foreign cities trying to get a fix. We’ve hunted down street art in ditches and mansions. And then in Athens, we nearly overdosed.