#5 – Antwerp Diamond Center
Antwerp, Belgium is home to one of the most impressive diamond vaults in the world. The vault was built in a collaboration between 1500 diamond merchants and is fitted with state of the art technology. Heat detectors, magnetic fields, a 3 ton door and lock with 100 million possible combinations are just some of the defence systems in place. Despite these extreme security measures, thieves somehow broke in and stole $100 million worth of diamonds in 2003. They set off no alarms and the break in was not discovered until the next morning when officials arrived at the Diamond Center.