IST, ZRH, LAX. There are also some surprisingly good contract lounges, for example FCO. I haven't been to LHR.
Originally Posted by
thejaredhuang
LHR, IST, NRT/HND, HKG, LAX, in this order nothing else is worth changing your routing for, FRA/MUC is standard Senator lounge, same as what LH offers in LHR except the German lounges have showers. ZRH has a nice lounge facility but the food is essentially the same quality/level as a standard LH Senator lounge
NRT/HND and HKG do not belong on the list IMO. Serviceable at best.