Adventure Extreme Expeditions ATI are one of the most experienced Mountaineering and Trekking operators in Europe. We are a British operated company based in the Alps - where else. We have been organising trips and expeditions to the worlds greater ranges for 15 years. We consider ourselves to be quite specialised, preferring to concentrate on providing our clients with expert and in depth knowledge of a limited number of outstanding destinations. Our experience is at your disposal whether you want to join one of our regular trips or allow us to help with your bespoke trek or expedition.