The Ulvetanna in Antarctica is one of the most remote and challenging mountains in the world.
It stands at more than 2,900 metres tall and temperatures can plummet to -40C.
But a team led by CBBC's Fierce Earth presenter Leo Houlding, has conquered the peak and turned the adventure into a film called The Last Great Climb.
Leo's entire trip was monitored by kids from schools in the UK and Leah went to find out about it.
Check out Leo's list of 5 of the world's most extreme climbs