our report tonight from nbc's john yang. >> reporter: tens of thousands have made the pilgrimage here to the northern tip of wisconsin, trudging more than a mile across frozen lake superior, like penguins marching over polar ice. their quest? a rare view of majestic, natural cathedrals of ice. centuries of crashing waves created the caves. weeks of arctic blasts, freezing falling water created the stunning ice sculptures adorning them. >> it's beautiful. >> reporter: icicles hang like delicate chandeliers, suspended pillars creating chambers accessible only by crawling. for photographers, the challenge is finding the perfect angle. for kids, it's a giant frozen playground. molly olman and peter johnson found it romantic. >> we just got engaged. >> reporter: the right spot for another kind of ice. in the summer months, i'd need a kayak to get in here. at this spot, the lake is about 40 to 50 feet deep. but instead of all that water, i'm standing on at least 18 inches of ice. with 88% of the great lakes now covered by ice, it's the first time in five years the ice has been thick enough

will create an environment and we believe we have put an alternative path for the leadership of john yang to choose. there are paths before it and there are conditions we can create to lead them down the continue toand we need to do that. ngosourage, in particular, to keep that front and center. as we found in the past, voices from the outside matter. to thee encouraging people. perhaps more so than if they attitude- caused the to change. this is the right thing to do and we will continue to put the focus we have on this human rights issue continuing going forward. >> please, come on up. >> i'm very new in this deal. professional.ical since you debuted the history of north korea -- >> the no ancient history or medical. the first kim, end of the second kim and taking power. senior, but there was no way to fight anymore. son does not like it? kill him. his son takes over. the same thing happens over and over again. , the same path. if you know it is there, then you can beat him. you cannot involve international but there is a constitution that the authority has. they have power or control o