Puerto Rico is a unique island with stunning scenery as well as a complex history and fascinating culture.
There are many caves in Puerto Rico, and the native Taino treated them as the home of their gods. There are also places like this - https://www.harbourlakespr.com/packages/camuy-caves-observatory/rio-camuy-cave-park-2/ and https://media.tacdn.com/media/attractions-splice-spp-674x446/0b/87/61/52.jpg (carved arch and old stone quarry), which suggest the work of a long, lost stone culture, similar to what we see in many places in the world. So you wonder how much tunneling/ancient human-cut stones was there already when the Spaniards arrived.
There are many caves in Puerto Rico, and the native Taino treated them as the home of their gods. There are also places like this - https://www.harbourlakespr.com/packages/camuy-caves-observatory/rio-camuy-cave-park-2/ and https://media.tacdn.com/media/attractions-splice-spp-674x446/0b/87/61/52.jpg (carved arch and old stone quarry), which suggest the work of a long, lost stone culture, similar to what we see in many places in the world. So you wonder how much tunneling/ancient human-cut stones was there already when the Spaniards arrived.