The heart shape is often found on medieval doors. Along with other simple shapes, like the triangles below, the heart is repeatedly seen on the old doors of St. Antonin.
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I am not sure of the significance, other than the obvious, but if you look, you will soon find hearts everywhere.
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Sometimes you will find them in the most unexpected places, like the door below, long forgotten.
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The heart on this bright door is tiny & not easy to spot, but to me, the brilliant red color says it all.
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In this detail, you can see the tiny hidden heart along with other striking hard wear.
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On this door one finds a heart, & other medieval elements, on one side & on the other, a modern intercom system, as well as, a "No Pub" ( publicity ) sign. I love the little window just above the door.
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The "hand" door knockers, which you also see many of, came later. You will often see an assortment of different locks, handles, & pulls on one door, each added at different historical junctures.
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The door below boasts an up side down heart along with other interesting decorative additions.
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It is hard not to be drawn to a door that invites you in with a heart. I am completely charmed by this medieval practice.
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Location:France