London Underground: Your Very Own Secret Lair
Do you spend a lot of time in London? Do you need more permanent accommodations than a hotel, but want something a little different than a rental apartment? Then perhaps you'd be interested in purchasing the Kingsway Tunnels.
Located 100 feet below central London, the tunnels are 77,000 square feet of prime underground real estate. The mile-long system of vertical and horizontal shafts could be converted for use as an interesting hotel, as an underground mansion or, of course, as a secret lair from which you could operate your world domination scheme.
The tunnels were originally built as air-raid shelters in the 1940s and have since been used as war command headquarters, document storage facilities and as some sort of early IT system that connected long distance telephone calls.
For the low cost of about £5 million ($8.6 million), you can step your game up to Dr. Evil status--or just have a safe place to ride out the economic crash.