When Dastan Kasmamytov wanted to propose to his boyfriend, one spot came to mind: The top of Denali, the highest mountain peak in North America. With the temperature sitting well below 0F (the average seasonal temp is around -30F), Dastan got down on one knee, and asked Christian Vettermann to marry him. They embraced each other through their many layers, and even managed a brief kiss. “I don’t know how many mountains we’re going to ascend tog…