We all know money can't buy happiness but it can buy an overnight stay in one of the world's most expensive hotel suites (with all the added extras). From lavish penthouses to apartments favoured by royalty and even an underwater suite, nearly all of these suites can only be booked exclusively on request, but there's no harm in dreaming a little, right? All prices correct at the time of writing. 

Click through the gallery to discover some of the world's most expensive hotel suites...