ELI5: What qualifies something as having a golden ratio?

Paintings like Girl with a Pearl Earring, Mona Lisa, Starry Night, buildings like the Parthenon, Eiffel Tower, Taj Mahal are often associated with the golden ratio and I just can't see it. I understand the Fibonacci sequence very well and that it isn't about the curvature, I can also see how the Sacrament of the Last Supper has the golden ratio to its composition but the rest I mentioned before doesn't seem to have them? Like they just slapped the golden ratio to the image and called it perfect. So I'm wondering what makes something as having a golden ratio.