Last spring, a Palestinian farmer was planting a new olive tree when his shovel hit a hard object. He called his son, and for three months, the pair slowly excavated an ornate Byzantine-era mosaic.

The tree stump in your yard might be the result of some overzealous trimming, the grave of a tree lost to last year's storms, or a "gift" left behind by a previous resident. No matter how it got there ...

Last spring, a Palestinian farmer was planting a new olive tree when his shovel hit a hard object. He called his son, and for three months, the pair slowly excavated an ornate Byzantine-era mosaic ...