Visit Semuc Champey

Limestone cave with a swimmable freshwater pool on Tongatapu.

Canyoning through 27 waterfalls — jumping, sliding and swimming down a limestone gorge near Puerto Plata.

Karst caves stuffed with Buddhas amid sugarloaf mountains.

Maya temples rising above the jungle.

Walk over warm lava fields and toast marshmallows on the vents of an active volcano an hour from Antigua.

Crater lake ringed by three volcanoes and Maya villages — Aldous Huxley called it the most beautiful lake in the world.

Drop into a limestone sinkhole of crystal-clear fresh water on the Yucatan, where the Maya saw the entrance to the underworld.

Hike a palm-lined canyon to turquoise pools, then swim through a crack in the rock into a hidden cave waterfall.