Go deep into Vietnam, Hang Sung Sot cave, Halong Bay

Arrive at the limestone caves:

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Tour caves so vast even the slightly claustrophobic are comfortable:

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Learn the difference between stalactites (the mineral drippings suspended from the ceiling):

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And stalagmites (deposits rising off the floor, built up from ceiling drips):

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Tour guides delight in showing things like this stalagmite (not what they call it) to tourists, shining lights on it to be sure no one can miss the reference:

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Now see them everywhere:

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Soldiers hiding here left their mark:

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Emerge back into the sunlight high above Halong Bay with all the tourist boats and some locals’ homes:

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Walk “home” to your boat:

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