Many abandoned mansions worldwide have fallen into despair over the years from lack of proper care, wrote Katie Warren, Libertina Brandt, and Taylor Ardrey for Yahoo Finance.

Some of them were worth the equivalent of millions of dollars at the time of their construction.

Today, they sit quietly, weathering decade after decade as they continue to deteriorate.

Among the ten most expensive ones across the U.S. is Lynnewood Hall in Elkins Park.

The 110-room, century-old Gilded Age palace was designed in the late 1890s by Horace Trumbauer. In today’s valuation, its construction costs would soar to at least twice the original cost.

While the structure is still in relatively good condition compared with some of the other listed abandoned mansions, it could still cost a whopping $40 million to bring the residence and the entire estate back to its former glory, estimated David B. Rowland, president of the Old York Road Historical Society.

Despite its decrepit status, the mansion is still worth millions to this day.

It was listed on the market for $11 million in July 2019, but has since been delisted when it was purchased privately to be restored.

Read more about the world’s abandoned mansions in Yahoo Finance.

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Video tour of Lynnewood Hall.