Vanuatu
Every soul left Ambae twice when the volcano stirred; its crater lake still shifts colour.
Ambae rises 39 kilometres long from black-sand shore to a cloud-held summit near 1,500 metres, gardens climbing the slopes between villages. High above them, hidden most days, three crater lakes sit in the caldera, and the largest changes colour, turquoise one visit, reddish-brown the next.
This island lives with its mountain in a way few places on earth still do. The 2017 to 2018 eruption of Manaro Voui was the largest at Ambae in recent history: ash and acid rain smothered gardens and water sources, a new island rose through Lake Voui, and the government twice ordered the entire population, around 11,000 people, off the island, ships carrying whole villages to Maewo, Santo, Pentecost and Malekula. They came back to a grey island and replanted it. Today the coast is settled and green again, with hiking trails, quiet southern beaches and some of Vanuatu's best birdwatching; the summit lakes sit inside the national volcano-alert regime, and conditions decide whether any route climbs towards them. Base on the coast, buy the morning's produce at Saratamata's market, and let the mountain set the itinerary.
Solo
Take a self-contained lodge base near Saratamata, shop the market early, and walk coastal trails while the summit keeps its own counsel.
Friends
Share the island journey and a village-run stay, treating any mountain route as a bonus the conditions may or may not grant.
Shop Saratamata's market early, when farmers bring in whatever is freshest, and cook it in a lodge's self-contained kitchen.
Home-style island cooking is the register here: laplap of grated yam or taro in coconut cream, wrapped in banana leaves and baked underground.

Edale
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The Pennine Way's first step, where the path vanishes upward into peat and cloud.

Mount Olympus
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Home of the gods — clouds swirl around 2,918 metres of limestone and myth.

Rush Lake
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At 4,694 metres, one of Earth's highest alpine lakes mirrors Rakaposhi and Diran in still water.

Bayano Caves
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Wade an underground river past hundreds of bats to where sunlight shafts split the dark.