The Giant Cone of Cartago

I have no clue what it is doing there in the park next to the ruins I posted a few days ago. It is tall, solid concrete appears to have been built in sections and assembled on site.

Better look at the base. It is about 4 to 5 ft in diameter and about 30 to 40 ft tall. Note the use of igneous aggregate in the concrete instead of the limestone you usually see in most concrete.