Monsanto is a village and a former civil parish in the municipality of Idanha-a-Nova, Portugal. In 2013, the parish merged into the new parish Monsanto e Idanha-a-Velha. They've been living under a rock. The stunning medieval Portugal village build in and around gigantic 200-tonne BOULDERS Living beneath a roof that weighs more than the average cruise ship may make some people a little nervous. But it is commonplace for the villagers of Monsanto in Portugal, who adapted their homes around the environment, filled with gigantic granite boulders. In the mountaintop village, homes are sandwiched between, under and even in the 200-tonne rocks.