Based on the information given in the article, it can be denoted that the best place for the construction will be Spain.
From the information given, it was stated that the friend is interested in a cave construction in the mountains in a certain area of this country and that the place must be safe against hurricanes, energy-efficient, and modern.
The best option will be Spain. It has different mountain ranges such as Sierra Nevada, Pyrenees, etc. Also, it's modern and industrialized.
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Nelson Mandela was arrested in Howick. Rumours were spread the Mandela’s connection with the communist made him a target of US officials.US officials continued to track the activities of Nelson Mandela, and they found a collaborator in the South African government.