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The tiny crystals have built up over the last several months, eventually creating flat terraces stacked atop one another like the travertine rimstone and dam terraces at Yellowstone’s Mammoth hot springs.

The tiny crystals have built up over the last several months, eventually creating flat terraces stacked atop one another like the travertine rimstone and dam terraces at Yellowstone’s Mammoth Hot Springs.

And on the far shore a creature that raised its dripping mouth from the rimstone pool and stared into the light with eyes dead white and sightless as the eggs of spiders.

Head deeper into the Xe Ban Fai valley for caving along one of the world’s largest river passages, to walk one of the world’s largest rimstone basins, and the chance to eyeball the world’s largest spider, the foot-wide giant huntsman.