The Cathedral is quite lovely. It had deteriorated a good bit over many decades, but has been restored. Remember you are in the tropics here and humidity and neglect can quickly cause deterioration.
I have been to Sts Peter and Paul in London, Westminister Abby, and Notre Dame de Parie, and Sacure Coure in Monmartre. This little cathedral has many similarities, but on a much more humble scale. There are side chapels much like Notre Dame. Each has a focus. Some are for artistic reverence, others are in active use.
The most famous of "residents" is that of Juan Ponce de Leon the 16th century explorer. While remembered as a successful explorer who brought gold back to his King and Queen in Spain, he and his Conquestadores, followed the instructions of his monarchs and eliminated much of the indigenous peoples where he traveled and ruled (Hispanola, Puerto Rico, Cuba, Turk, and Bimini). He died and was originally entombed on Cuba. In the 20th century, his remains were placed in this cathedral where he once lived. The ground the cathedral is on was originally gifted to the Catholic Church as part of the land originally "given" to Ponce de Leon by his monarchs. There is a lovely marble sculpture that commemorates his internment.
Among other figures of note, there is a glass-enclosed Catafalque of Saint Pious (St Pio), who's 1st Centuary martyrdom sealed his Sainthood. If you look carefully, the porcelain body masque allows you to see his teeth, and some of his scull and hair. The martyre was given to Puerto Rico in the 19th century upon request of Mariano Rodríguez de Olmedo, the then bishop of Puerto Rico, went to Rome and requested of the Pope, a relique that could grace the cathedral in San Juan. This soldier, martyred as a 1st Centuary Christian was bestowed by the Pope to fill that request.
The ceilings and walls have many beautiful Baroque-like embellishments that are all the more remarkable because without the materials and funds of the great cathedrals of Europe, the embellishments are painted. The overall effect is quite beautiful.
I am not at all sure of the dedication, but a niche off to the right has a sculpture of the most life sized and realistic Christus Rex I have ever seen.
If religious art just isn't appealing, skip it. For the pious and curious it is really a humble and small, but traditional cathedral. (Note the statue of Mary in the rear of the church, with the wooden handles exposed for posada on special occasions.)
I will post some pictures. They aren't great quality, but perhaps will give you a feel for the place.
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