"Approaching Tuktoyaktuk, great pingos—dome-shaped earth-covered mounds with ice cores—come into view. Pingo Canadian Landmark features eight of the 1,350 pingos found in the region, including the 160-foot-high Ibyuk Pingo, the second-tallest in the world. In summer you can get a closer look, but you’ll need a boat: Find a local outfitter offering motorboat tours or rental canoes in Tuk."