Lots of apartments have long hallways that are seen as wasted space. Consider putting yours to use as a gallery...
From larger works arranged the full height of the wall to a gridded layout of snapshots in matching frames, the hallway is a perfect place to display an artwork or photography collection.
If it's at your home's entry, everyone passes through the space and has a chance to appreciate it. If you have a hallway in the depths of your home - say leading to rear bedrooms - you and your family can reflect on a gallery as you pass from the public to the private realm of the home.