Architectural murals that portray exterior structures are often paianted on the outside of an existing building, to transform a simple brick or stucco wall into something that might resemble a New York landmark building, a Spanish Villa, etc...In addition, they can be painted in an interior to create the feeling of being outside, looking at other buildings, thus opening a space up for the viewer. For example, in Las Vegas, the Caesar's Forum shops, all enclosed structures, used a lot of scenes of exterior architecture and archetectural details to create the illusion that shoppers are in a Roman city.