In Austria they say temporary solutions usually last longer than permanent ones... in 1892 the city built a temporary subway station (temporary becaus it was close to a bridge scheduled for a major redesign and they planned to build the permanent station after the bridge work was completed). The temporary station lasted until about 1960... the permanent station built afterwards was demolished again in 1978. So that makes 68 years for the temp solution and 28 for the permanent... nice, huh?