Location: Windlesham, Surrey, UK

House Area: 4,400 square metres

Site area: 23 hectares

Description: Larger than both Buckingham Palace and Hampton Court combined, Updown Court claims to have incorporated 'everything you can think of that anybody can want', and with a price tag of £70 Million you certainly hope they're right. Located in the village of Windlesham in Surrey and within easy reach of both London and Heathrow airport, the 21st century mansion is being marketed to billionaires the world over.

Offering 103 rooms in four principle buildings, the estate features five swimming pools (including an infinity pool on the roof of the main house), a private cinema, a heated marble driveway, a bowling alley, a tennis court, a garage for up to eight cars and a stable for six horses.

Many houses have on-suite bathrooms, but not many can boast an en-suite swimming pool. Before you get out your cheque book however think about this; the heating bills to run the estates 40 gas boilers are predicted to cost £250,000 a year alone, and with all that marble (around 250 tonnes of the stuff) it could get rather chilly.