Hotels.com has revealed that the cost of a night in a luxurious hotel room has tumbled worldwide, meaning that travellers' money has never gone further. According to Hotels.com's Hotel Price Index (HPI), there are now a crop of ten desirable destinations where £100 per night (or just £50 a night each for a couple) will buy a five star room in some of the most prestigious addresses in town.

The list of cities where British travellers' cash goes the furthest includes top European cities for culture vultures (£100 will get a five star room in Lisbon, Pisa, Warsaw, Prague and Tallinn), as well as further-flung destinations including Melbourne, Mexico City, Sao Paolo and Toronto.

The Hotels.com HPI tracks the real prices paid per hotel room (rather than advertised rates) for 78,000 hotels across 13,000 locations around the world. The latest HPI looks at prices from January to June 2009, compared to the same period in 2008.

Alison Couper, Communications Director at Hotels.com, said: "The best rooms in the world have never been so affordable according to our data and travellers can get far more for their holiday money this year than they have for a long time - the average price of hotel room is back at 2004 levels. With such low prices and some great deals around, travellers can enjoy a night in the lap of luxury for less than ever."

For £100, travellers visiting Toronto, Sydney, Copenhagen and Edinburgh hotels will be able to stay in rooms that are a full star category higher in 2009 than the same money would buy in 2008.