Explore the ancient caves of Hang Son Doong, Vietnam. Hang Son Doong is one of the largest caves in the world and features a fast-flowing underground river. For spelunkers, exploring Hang Son Doong is the equivalent of scaling Mount Everest.
Xcaret’s underground rivers are part of a large cave system that forms deep under the surface of the Yucatan peninsula in Cancun, Mexico. Mike and I LOVED Xcaret! This river was amazing and so relaxing!