Inside America's unfinished and abandoned mansions

Mansions in the US have been left untouched and undesirable, including 's and 's 56,000 square-foot custom pad in .

Another massive home on a remote island in , and a 'zombie mansion' near , have also sat vacant for years.

The properties have struggled to sell because they have been left unfinished and lack basic necessities like electricity and water.

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