The city's principal railway terminus, which is worth entering for its grand interior, which you can access from Gordon Street on the north side of the building. On the exterior, a feature of note is the massive glass walled bridge (known as the Hielanman's Umbrella) which spans Argyle Street and holds up the tracks and platforms. You can go on a tour of the station, which is highly recommended, but booking in advance is essential and places sell quickly. Don't be put off because you aren't interested in trains - the tour is mostly about the history and architecture of the station. The guides are really enthusiastic about railway history and have countless stories to share of the station's place in Glasgow's history: through the industrial revolution, through the war and to the present. You also get to visit an abandoned underground platform! The £13 entry fee goes into a pot earmarked for preserving the station's history and improving the tour.