Introduction to follow.
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See the blue flames burn on Kawah Ijen's crater floor at 2am
The miners start work around midnight, headlamps bobbing up a black slope of loose scree, baskets built for eighty kilos of sulphur balanced across their shoulders.
Best time:Dry season, for clearer skies and safer trails
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Photograph Half Dome from the spot Ansel Adams stood in 1927
In April 1927, Ansel Adams climbed to a ledge above Yosemite Valley with a glass-plate camera, a heavy pack, and only a couple of plates left.
Best time:Late June to early October, once the high trail is free of snow
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See the cherry blossom in Kyoto
The blossom lasts about a week, and the whole country follows a forecast for it, like weather.
Best time:Late March to early April, depending on the year
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See the northern lights from Tromsø
The first time, it looks like a cloud that someone has lit from behind.
Best time:Late September to late March