City art is always something to look at, especially in a popular city hub such as Pittsburgh.
Street art is always large and extravagant, and you can usually find it in extreme public places.
Some of this art only looks good at a certain time of day however.
During the day, an alley can be boring and unremarkable, but at night...
You can find some pretty breathtaking sights at 4 in the morning as it turns out. And they can make even the barest alleys seem alive.