Designed to provide the ultimate in security, military bases never come cheap. But on top of the eye-watering sums of money required to get them up and running, facilities for the armed forces can also be outrageously expensive to decommission. 

Read on as we infiltrate 10 of the world's most jaw-dropping abandoned bases, revealing how much they cost to construct and, in some cases, shut down.

All dollar amounts in US dollars.