The phrase "Deze oude kerk moet aan de rechterkant liggen, tegenover de markt." in your question translates to: "This old church should be on the right, opposite the market." Since the rest of the directions mention the grocery store as being behind the old church, it suggests that the church is located next to the grocery store, with the market situated across from them both. Therefore, the answer to what is next to the grocery store is: LOCATION: The old church