Shape

Architecture can be a challenge to photograph. Not in the sense of walking up to it, setting the proper exposure and pushing the shutter. Often, buildings are cluttered by their surroundings, which makes it hard to take them in. If you slow down and look you will see small things, the details that went into the structure. The elements that work together creating the whole. It's then you will find that there is a lot to photograph. Then the challenge becomes capturing the essence of the building and not setting the exposure and pushing the shutter.