Time travel: An isochronic map of travel times from London circa 1914
An important dimension missing in this type of map is cost of travel. If you are willing to spend sufficient money, my guess would be you could reach pretty much any spot of land on earth within about 48 hours, with the appropriate combination of helicopter and private jet... But if you limit yourself to, say, 2000 Euros, you could probably make it to many places, but it would take significantly longer.