Watch mesmerising footage of an avalanche
Snow buildup in the Rocky Mountains leads to massive collapse. Here’s what happened next. Images from the show Hostile Planet.
Discovering the rock churches of Ethiopia's Gheralta Mountains
In Ethiopia’s northernmost region, the precipitous Gheralta Mountains are a formidable frontier. But hewn into them are ancient, inaccessible churches that make a challenging ascent all the more rewarding.
