There's something impossibly charming about a mountain town in winter. Lantern-lit cobblestone streets, glowing cafes filled with friendly locals, and intimate family-run inns warm even the coldest, shortest of days. Add fresh mountain air, high-altitude views, snow sports, and steamy thermal springs, and you just might find yourself falling for winter. But don't expect crowds: These charming little hamlets are, for now, relatively undiscovered. From Colorado to Japan, here are 10 off-the-beaten-path mountain towns that are especially enchanting during wintertime.