Alongside her husband Ranulph Fiennes, discovered the lost city of Ubar.
In 1972, she masterminded the Transglobe Expedition, the first expedition to circumnavigate the world along its polar axis.
Was noted as being a highly proficient farmer, raising award winning Aberdeen Angus cattle and a flock of black Welsh Mountain sheep.
Alongside her husband Ranulph Fiennes, she wrote the best selling book 'Bothie The Polar Dog', about their titular Jack Russell Terrier, the "only dog ever to set paw on both the South and North poles".
In 1968, Fiennes organized the first ascent of the longest river in the world, the River Nile, by prototype hovercraft.
In 1987, she became the first woman to receive the Polar Medal.
She was the first woman to be voted in to join the Antarctic Club in recognition of her research work for the British Antarctic Survey and University of Sheffield into very low frequency radio propagation.