The labyrinth carved on the facade of the Cathedral of Lucca.
One of the most photographed and recognized signs of the Cathedral of San Martino in Lucca is this labyrinth and the phrase carved to its right.
There are many hypotheses about its meaning even if the carved phrase refers to the labyrinth of Daedalus.

As usual, I don't copy and I refer you, further down, to another site that explains more.

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Photo taken with Canon EOS M100 and lens Canon EF-M 11-22.

To see all the photos I took of the Duomo click here:

But what really captures the attention of many visitors is the small labyrinth carved in stone, located in the right pillar of the portico of the facade. This bas-relief figure is one of the most enigmatic in Italy.
Continue and learn more on Wikipedia

The labyrinth carved on the facade of the Cathedral of Lucca – Le labyrinthe sculpté sur la façade de la cathédrale de Lucca – El laberinto tallado en la fachada de la Catedral de Lucca – O labirinto esculpido na fachada da Catedral de Lucca – Das in die Fassade der Kathedrale von Lucca gemeißelte Labyrinth – Mê cung được chạm khắc trên mặt tiền của Nhà thờ Lucca – 卢卡大教堂正面雕刻的迷宫 – ルッカ大聖堂の正面に刻まれた迷宮