Cracking geysers: the world’s most thrilling hot springs – in pictures

In this reserve, the established road disappears, replaced by faint, wind-whipped tyre tracks across red sand. Visitors are admitted only with approved Bolivian guides, and tour groups leapfrog along in 4×4s, making the same stops: the rock formations for picnic lunches, the four lagoons, a tree-shaped stone, and finally, the entrance to the reserve, where credentials and passports are logged. The journey feels mysterious, each turn arbitrary and surprising. There are no signs to point the way

The Guardian