Model answer
Written by 8020 teachers. Do not memorise it — take the structure and the way ideas are developed, then speak about your own life.
The building I'd talk about is a cathedral in the centre of the city I grew up near, a fairly old one, built sometime in the late nineteenth century using materials that, from what I understand, were actually shipped in from Europe at the time, which explains why it looks so out of place against everything around it. What it looks like is hard to do justice to quickly — twin towers, a lot of reddish brick rather than the pale stone you'd expect from that style, and stained glass windows that throw these enormous coloured patches of light across the floor inside on a sunny afternoon, which is honestly the detail that's stayed with me most over the years. It's still used for its original purpose, regular services, weddings occasionally, though it's also become something of a landmark that has very little to do with religion for most people who visit it now, myself included. Why I find it interesting isn't really the architecture on its own, impressive as it is, but more the way it sits there stubbornly unchanged while an entire modern city has grown up around it over more than a century — glass office towers a few streets away, motorbikes everywhere, and then this one building that seems to belong to an entirely different pace of time. There's something almost defiant about that contrast that I don't think I fully appreciated until I moved away and came back years later and saw it with slightly fresher eyes.