K'un-Lun is a mythical city in the Marvel Comics universe, often associated with the character Iron Fist. It is depicted as a hidden, mystical place located in the Himalayas, accessible only during specific celestial events. K'un-Lun is known for its advanced martial arts and spiritual teachings, attracting warriors and heroes seeking to hone their skills. The city is home to the Immortal Weapons, a group of champions who protect its secrets and uphold its traditions. K'un-Lun plays a significant role in the backstory of Danny Rand, the protagonist of the Iron Fist series, who trains there to become a master martial artist.