Gunung Mulu National Park earned its UNESCO World Heritage listing for good reason: this is one of the most extraordinary karst landscapes on Earth. The Pinnacles — razor-edged limestone spikes rising up to 45 metres out of the rainforest canopy — are reachable only by a demanding multi-day trek, but the reward is a view found almost nowhere else on the planet.
Beneath the mountains lies an equally staggering world. The Sarawak Chamber, discovered in 1981, is the largest known cave chamber on Earth by area — big enough, by some estimates, to fit 40 Boeing 747s. Clearwater Cave forms part of one of the longest cave systems in the world, and every evening at Deer Cave, millions of wrinkle-lipped bats spiral out at dusk in a display known simply as the bat exodus.
None of it requires technical caving experience — Mulu's show caves are set up with walkways and boardwalks for ordinary visitors, while the Pinnacles trek and the park's canopy walkway are there for anyone wanting to go further. Few places pack this much natural spectacle into one national park.