Visitors to Glenn Young’s Monolithic Dome home often have a problem finding his front door. And that’s surprising, since Glenn’s home is anything but small. It has 3000 square feet of living space within five, interconnected Monolithic Domes flanked by two EcoShells. Entrance tunnels lead into these EcoShells or foyers. A 15-foot-diameter EcoShell with a three-foot stem wall serves as a front foyer while a 12-foot-diameter EcoShell with a four-foot stem wall serves as the back one for this totally underground dome-home.