The Church That Has Been Standing Since 1743

Costa Rica does not have much colonial architecture left. What it has, largely, is here.
Why This One Survived
The church of San José de Orosi was finished in 1743 and has been in continuous use ever since, which makes it the oldest working church in the country. That sentence gets repeated in every guidebook and it undersells the thing considerably.
Costa Rica sits on a seismically busy stretch of the isthmus and its colonial buildings have mostly been shaken down, burnt out or replaced. Cartago itself was flattened in 1910. That a low adobe church in a river valley outlasted all of it is less a matter of engineering than of luck and a very sensible roofline.
What It Actually Looks Like
It is not grand. That is the point. A long white single-nave building with a tiled roof that comes down low, a squat bell tower at one end, and a covered walk running the length of the front where people sit out of the sun.
Inside, the floor is worn, the ceiling is timber, and the light comes in sideways. There is a small museum of religious art attached, run by the parish, with vestments and carved figures that came up from the coast on mule.
Going
It is in the middle of Orosi town and you will not need directions once you are in the valley. Mass times are posted at the door and the sensible move is to look at them before you arrive, because it is a working parish and not a monument.
Give it twenty minutes. Then walk out the front, cross the road and look back at it with the green wall of the valley behind, which is the view that makes people stop the car in the first place.

