"Rio Secreto is also known as Mexico’s underground river. While just recently becoming a tourist destination, it’s likely that Río Secreto patrons will only grow. After all, with its thousands of stalactites and stalagmites along the river’s edge, visitors are left feeling as if they have traveled back in time, and to a place untouched by human hands. The underground passageways of seemingly endless tunnels stun the senses and will absolutely take your breath away."