What are the best caves in the world?

Answer 1

Well, this is a bit of a subjective question, as all spelunkers are perhaps looking for something different, such as lots of spelothems of limestone or maybe lots of gypsum. Some people might think the largest are the best while others might think the smaller challenging ones are better. Some might prefer commercial caves while others prefer wild caving.

Typing "best caves" into Google give some great results.