To get there, a punishing path and 90 percent humidity test even the fittest hiker. A walk for the fortunate few: Only a limited number of travelers are allowed to visit these caves each year ...

There are four Caves to find on the Firework Isles. We've got more pictures and details below, but at a glance, here's a map of all Firework Isles Cave locations in Infinity Nikki: Image credit ...