Basilica of the Trinity

Where the 15th and 16th century basilica in Flamboyant Gothic style now stands, there was already a church in the 10th century. Note the gables and pinnacles decorated with leaf work and medieval animal figures like gargoyles. The square bell tower above the portal, named "Tour Sauvage" after architect Le Sauvage, was added in 1828. Inside, the gallery decorated with sculptures and murals on the north side shows a 16th century dance of death and on the south side scenes from the Passion. The baptismal fonts are from the 15th century.

A visit to the church from the inside is worth it!

In the 15th century, a new Gothic-style church was built on the remains of the previous Romanesque church to replace the older one.
The church was never completely finished and continued work on it in later centuries, in different styles: one example is the Chapel of the Holy Sacrament. In 1794 the church was looted by the revolutionaries who destroyed the monument to the Assumption of the Virgin Mary. In the 19th century, the city architect Geufroy restored and consolidated the building. In 1828, the central portal with the Romanesque porch from the 10th or 12th century was built over with a 26 m high square tower, and the arch of the portal itself was rebuilt. The high altar dates from 1809.
de.wikipedia.org/wiki/Ste-Trinité_(Cherbourg)

This church was not dedicated to one of the many people who died as martyrs (witnesses of faith) for their Christian beliefs, or who we venerate as blessed or saints because of their exemplary way of life. Rather, this parish has chosen God himself - in the "Holy Trinity" - as its patron saint. According to Christian teaching, we believe in ONE God who exists in THREE persons - God the Father, God the Son (Jesus Christ) and the Holy Spirit.The following description can be found on the EKD (Evangelical Church in Germany) website: "The word tries to express the seemingly impossible, namely that God is three and one at the same time. To understand this, it helps to consider how people have experienced God throughout history: as a creator who loves his world and people like a father loves his children. As a God who became human himself in Jesus Christ, his son, and shared human life. And finally as God who is still present and alive among people in the Holy Spirit.”