There is a rail-border-crossing location between two European countries, which features a huge and magnificent railway station -- seemingly incongruous in its remote rural surroundings. This station has always had a "white elephant" quality: it, and the route on which it lies, opened definitely late in the railway age; the cross-border route had a chequered working history of only a few decades, and as at the present time, has been out of use for longer than it was open (the station concerned, is still the terminus of a rail service from one end of the route). This venue was the subject of a recent television documentary.
Please name the station, and the two countries involved.