The group is on the hunt for "preservation-minded investors" to fund their restoration efforts and is working on a National Register of Historic Places nomination, to help protect the property. One thing's for sure, the group will need to obtain a fair amount of support. A historical restoration architect has estimated that it would cost approximately $50 million (pound;44.4m) luxury condos for sale near me to return the house to its former glory. But you can't put a price on history, can you? Similar results nearby Unfinished riverfront mansion for sale at $4 million Source: Register for Scotland As if the mansion's upside-down columns, doors that open on to solid walls, and stairs that lead to the ceiling aren't peculiar enough, the Winchester Mystery House was also left with unfinished rooms and walls with loose nails when work on the 160-room abode was halted following Mrs. Winchester's death in 1922.