Llangorse attracts around 50,000 visitors every year, but most of them stay down by the lake. On this walk, Derek headed away from the water and up into the hills to Allt Yr Esgair. It's an ideal walk ...

A river in Colombia turns different shades of colour in a natural display that happens nowhere else on Earth. Just east of the Andes, central Colombia’s Caño Cristales is a river like no other ...