Witness an active volcano erupting or showing volcanic activity, such as lava flows or ash plumes
Watch rotating thunderstorm formation with distinctive structure
Witness world's strongest tidal current in Norway's narrow strait
One of Africa's highest single-drop falls.
Thundering 45-metre falls hidden in forest near Ciudad del Este.
Rainforest canopy rope walkway.
Neon sulphur pools, salt flats 125 m below sea level and the Erta Ale lava lake — the hottest inhabited place on Earth.
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