Known for its glistening coastline, designer boutiques and countless casinos, Monaco is a sovereign city-state that was designed for the wealthy. A well-known tax haven, this billionaires' playground doesn't charge residents income or capital gains taxes, so those lucky enough to live here can see their money stretch further – but that doesn't mean living here comes cheap!

According to Numbeo, a single person's estimated monthly costs are around £1,510 ($1.9k), before rent. The price per square foot to buy an apartment in the city is £5,207 ($6.6k), which means a 1,000-square-foot (93sqm) apartment could set you back a cool £5.2 million ($6.6m).

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