1.Bunkers
And finally, the most expensive security system in the world is represented by the well-known Bunkers.
Price: $1.550.000+
Bunkers are not security systems, but pretty much a lifestyle. The geothermal powered systems can host people for long periods of time, them being as comfy as it can get (for the billionaires, of course).
The bunkers can have spas, restaurants, or amphitheaters, so the rich won’t feel any differences from their way of living. These systems are used in case of very serious natural disasters, and they also have ammunition for personal use.
These were the security systems of the rich!