This is Gangkhar Puensum, the highest unclimbed mountain in the world at 7,570 meters. No one in history has ever reached the summit, and likely no one will for a long time.
The mountain is located in Bhutan, which has banned climbing for religious reasons, so reaching the summit is not only physically difficult, but also legally impossible.
The highest peak in this category is Muchu Chhish in Pakistan, at 7,453 meters, an incredibly challenging mountain that has only been climbed twice in history.
As a species, we have been both to the Moon and to the deepest part of the ocean, but there are still several dozen mountains around the world whose peaks have never been reached by anyone, making them perhaps the most difficult places to reach on the entire planet.