An explorer is taking on seven marathons in the most remote corners of all seven continents, inspired by a promise he made to his late veteran grandfather to fight for a cure for dementia.Louis Alexander started the challenge last October and has since completed marathons in the Agafay Desert, in Morocco, the Wadi Rum desert, in Jordan, Alaska, and the Australian Outback, with the average time of each run between five and six hours.

An explorer is taking on seven marathons in the most remote corners of all seven continents, inspired by a promise he made to his late veteran grandfather to fight for a cure for dementia.Louis Alexander started the challenge last October and has since completed marathons in the Agafay Desert, in Morocco, the Wadi Rum desert, in Jordan, Alaska, and the Australian Outback, with the average time of each run between five and six hours.