Snorkel over warm volcanic bubbles.
Soak in a naturally warm pool on an uninhabited island, icebergs drifting past.
High-altitude geyser field steaming at dawn, 4,300 m up in the Andes.
Geysers, hot springs and Maori culture.
White travertine terraces and pools.
Mineral springs that have petrified into white waterfalls of stone above the Oaxaca valleys, with cliff-edge pools you can swim in.
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