We found a bricked-up fireplace in our livingroom!  We knew there had to be one somewhere because the original occupants would have frozen without a fireplace.  So my husband got the hammer and- BAM!  Fireplace.

It's hard to make out in this picture, but the fireplace has an arched opening.  We're planning on putting a fireplace insert and liner in here this spring.  It'll be expensive, but worth it!