Breezing in and out of the front door day to day, we rarely pause to consider its vital importance. Besides keeping out the weather—and intruders—the front door makes or breaks a home's curb appeal. Maybe that's why Remodeling magazine found, among all popular home upgrades, front door replacement provides the single highest rate of return on investment. The project virtually pays for itself, even while it gives a facelift to the facade of your home. Click through to see eight before-and-afters that prove, once and for all, what a difference a new door can make!