I went up to St Andrews to visit two friends from Yale, one who lives in Scotland and one passing through. When I got my tickets, which were for a train connecting to a bus, I had to remind myself that transportation in this country runs on time and thus that everything would be fine. It was.
The historic Holy Trinity Church in St Andrews was where John Knox preached his first sermon, or something like that. It’s clear that now it functions at least as much as a museum as as a church.
The other religious heritage gem in St Andrews is the ruined cathedral, which was first built in the 12th century; what remains now dates to the 14th century. It was ruined because of the Reformation, but I don’t know exactly how. There’s a graveyard next to it, with rather more modern (19th-century) graves; many appear to be Catholic, but one large memorial was for a minister who was important in the Church of Scotland, so I don’t know the story.