This theological concept arose in the mediaeval western church, being neither heaven nor hell, but a place where the souls of the deceased stay until they have suffered in recompense for their sins, at which point they are released to their heavenly reward. (I've probably misrepresented the doctrine, but oh well.)
My loathing of airports increases whenever I am forced to spend time in one. Well actually, the Queen Alia International Airport in Amman was "not bad," but as a transit hub, Heathrow Airport in the UK has nothing but gross commercialism to "recommend" it. The good news is that I will be able to breathe fresh air again in another ten hours, but between now and then I will be simply trying to refrain from screaming. I have not been confined indoors for this length of time in... well, I don't know. Years? Decades?
If I ever leave North America again, I owe it to myself to investigate the option of shipping out on a "tramp steamer" -- if those still exist. Or, I suppose, pay triple or quadruple the price for a direct flight.