I honored my late grandmother’s final wish by rebuilding her home—and in doing so, discovered a hidden cellar beneath it.

“Listen closely, my dear grandsons,” she had whispered gently from her bedside, her voice fragile. “Your grandfather built this house for me when we were just beginning our lives. I’ve spent my whole life here, and it holds countless precious memories. All I ask is that you restore it in his honor.” Walter and I…