Cueva de los Gritones

Tucked away in El Peñón, the Cueva de los Gritones (Cave of the Screamers) is a wild little karst cavity famous for its insane natural reverb—shout something and the walls throw it right back at you, hence the name. A local guide walks you through the short but rugged route, pointing out the geology and the resident bat colony. Bring a flashlight and wear closed-toe shoes you don't mind scuffing up; you'll be crab-walking and ducking through tight squeezes. It's the perfect first stop for a morning of legit adventure in Barahona—pair it with a dip in the nearby blue holes (cenotes) and you've got a solid half-day locked in.

A karst cavity carved out by water eating away at limestone over millennia in El Peñón, Barahona. The name comes from the amplified echo that bounces around the chamber when you talk or yell—a natural acoustic trick that never gets old. It's long served as a shelter for wildlife and a landmark on local trails; these days, it's a must-hit on the South's ecotourism circuit for its one-of-a-kind sound and gnarly rock formations.