This is the "An Extensive Landscape" by Philips Koninck, painted in the Dutch north around 1670. As you can see here, it's a very expansive landscape - actually, it was a common theme for Koninck and his contemporaries. In the foreground, but still far away, are assorted animals and people, some working, some chatting, some just idling away their time in the sun. Away among the trees are churches, pavilions, towers, and humbler dwellings. There's even a bridge crossing a river to a windmill. And further off, the sun catches a lake with a town on its banks. Koninck was known for these kinds of landscapes, usually imaginary but incredibly grand and tranquil. And take a look at all those tiny details within - it's easy to get lost in them.
An Extensive Landscape hangs in The National Gallery on Trafalgar Square, London — free to enter. Point your phone at any artwork there and audioguide.london plays a free audio guide in six languages — no app download needed.