There are longer caves than Hang Son Doong—the Mammoth Cave system in Kentucky, with 367 total miles, holds that record. There are deeper caves too—Krubera-Voronja, the “crow’s cave ...

The Waitomo Caves are a system of caves south of Auckland on ... the effect has become a popular one for tourist photos. Hang son Doong cave is so large, it is said that a passenger jet could ...