No longer content with a multimillion-dollar mansion (and mini-mansion), now the super-rich are ploughing money into underground bunkers for "ultimate survival". Able to withstand a nuclear blast, armed attacks, earthquakes and tsunamis, and pandemics, hardened facilities such as the Vivos Europa One (pictured) in Germany will keep its billionaire owners safe. This particular one is a five-star, invite-only survival complex, and is valued at around $1 billion (£730m).

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