Vladimir Putin's secret palace, located on the shores of the Black Sea, is one of the best guarded places in Russia, but also one of the most secret. No one can approach and there is even a ban on flying over the palace.It is not a holiday home or a simple residence, but an entire city or even a kingdom. With hundreds or even thousands of employees, impenetrable fences, its own Black Sea port, a church, a flight ban and even checkpoints, Vladimir Putin's secret palace looks like a state within a state.