// A much more affordable and effective alternative to glass greenhouses is the walipini (an Aymara Indian word for a "place of warmth"), also known as an underground or pit greenhouse. How a walipini works, and how to build it:
Amazing Shed Plans - He Builds a Greenhouse from Old Windows More Now You Can Build ANY Shed In A Weekend Even If You've Zero Woodworking Experience! Start building amazing sheds the easier way with a collection of shed plans!
DIY Greenhouse Underground A trench runs down the middle of this DIY greenhouse for any climate. The concrete block walls form a heat sink that soak up the heat during the day and release it slowly as temperature cool. Farm and Garden - GRIT Magazine
Abandoned Victorian Style Greenhouse, Villa Maria, in northern Italy near Lake Como. The exact location of the photo was over the hotel Villa Carlotta in Tremezzo near Lake Como in northern Italy. The Villa Maria has undergone a restoration since