The players are overestimating how much the show expects them to know about European geography

Based on the destinations we've seen so far, I'd be very surprised if they went to a city like >!Ljubljana!< or >!Zagreb. !<The producers seem to be sticking with places they're confident the average American has heard of. If the show gets picked up for more seasons, they may have to broaden their horizons a bit, unless they want to just keep coming back to the same handful of famous cities every season.