Even the most expensive homes can fall into a state of disrepair. From the Spanish holiday home of Saudi royalty to the extravagant wastelands of London's Billionaires' Row and the burnt-out remnants of the Carnegie mansion in the US state of Georgia, these mansions were once worth a fortune. Yet today, they stand derelict and exposed to the elements.

Click or scroll through and take a look inside these abandoned mansions once home to the world's super-rich...