Things to do in  Arecibo

One of Arecibo’s most popular destinations, Cueva del Indio draws travelers to its beautiful caves high above the Puerto Rican countryside. The hike there is rigorous and involves navigating rocky ledges, but the amazing views—along with the chance to see ancient pre-Columbian rock paintings and carvings—make the effort worthwhile.

Known for its soaring interiors, million-year-old stalactites and stalagmites, and namesake underground river, Rio Camuy Cave Park (Parque Nacional de las Cavernas del Río Camuy) in Puerto Rico attracts nature lovers and casual visitors alike. The 268-acre (108-hectare) complex is most famous for its cave tour, but it also offers picnic pavilions, walking trails, and a playground.

The Arecibo Observatory is home to the William E. Gordon telescope, a single-aperture telescope that measures more than 1,000 feet (300 meters with a 40-degree cone of visibility. Its discoveries have included the rotational rate of Mercury and evidence of neuron stars.