Pankaj Oswal's House

Oswal is a former ammonia tycoon whose empire collapsed in 2010. Once one of Perth's wealthiest entrepreneurs (A$2 billion), he has since moved overseas and signalled he has no plans to return to Perth.
He spent nearly $22.7 million snapping up eight lots to build a $70 million mega mansion, which was to have included seven domes, six bedrooms and parking for 17 cars.

But, as you can see, the home was never completed.