We wanted to fix our sloped yard without spending a fortune, so we built a DIY boulder retaining wall. It’s strong, simple to ...

Building a wall by precisely stacking randomly shaped boulders could almost be the definition of hard work – both physically and mentally. It's the sort of thing we might want robots to do one day, so ...

Size the trench so there's enough room for the retaining wall block and at least 8 in. of space behind it. Excavate deep ...