Derinkuyu Underground City, Cappadocia region 18 miles from Nevsehir,Turkey. It is one of over 200 underground cities discovered in the region, but it is notable for being the biggest and the deepest. With 11 floors & depth of this ancient city can a
Fresno’s best kept secret, the Forestiere Underground Gardens is a beautiful hidden treasure of California consisting of hand-excavated farmland transformed into a spectacular maze of underground caverns and tunnels .
I like the idea of a bridge or balcony space over the water. Could play with the reflection and scenes from the water using levels Underground Lake - Ryusendo Calcareous Cave - Iwaizumi town - Japan - *explored*
"Simon and his father-in-law built this hobbit house in just four months. Read more: Extraordinary Off-Grid Hobbit Home in Wales Only Cost three thousand pounds to Build Simondale Hobbit House – Inhabitat - Green Design Will Save the World