Building (n) - A structure that has a roof and walls and stands more or less permanently in one place.
Question #1: Do you know of any building that didn't have a builder?Painting (n) - Any work of art in which objects are represented in color on a flat surface.
Answer: Yes. They are called caves.
Question #2: Do you know of any painting that didn't have a painter?Car (n) - A self-propelled vehicle used for transporting passengers.
Answer: Yes. Sticking with the "flat surface" part of the criteria, butterfly wings.
Question #3: Do you know of any car that didn't have a maker?
Answer: Yes, but you won't like the answer. See below.