10 most difficult Alaska riddles

Yukon, having 1,979 mil (3,185 km), is just 223 miles shorter than Mississippi. Despite its length, there are only four vehicles-carrying bridges across the river.

The woolly mammoth was the last among mammoth species. They have vanished from Europe and southern Siberia about 10,000 years ago, but a small population survived on the St. Paul Island, Alaska, up until 3750 BC, and the small mammoths of Wrangel Island survived until 1650 BC. They were still around when the Egyptian Pyramids were being built.

Alaska was colonized by Russian fur traders. Rather than hunting by themselves, the Russians forced the Aleuts to do the work for them. Many of Aleuts had been removed from their home islands and sent as far south as California to hunt sea otter.

Balto was a sled dog who led his team on the final leg of the 1925 serum run to Nome, in which diphtheria antitoxin was transported to combat an outbreak of the disease. After the mission's success, Balto and the Norwegian Gunnar Kaasen, who drove the sled, became celebrities.

The Begich Towers Condominium is a building in the small city of Whittier, Alaska, about 58 miles (93 km) southeast of Anchorage . The structure is notable for operating like a small-scale arcology, being the residence for nearly the entire population of the city (the 2016 estimate was 214 people), as well as containing many of its public facilities. This has earned Whittier the nickname of a "town under one roof".

The total length of the river is 1982 miles (3190 km). There are only four vehicles-carrying bridges across the Yukon River.

The Great Kobuk Sand Dune is located 65 km behind Arctic circle. Summer temperature may reach as high as 29°C! The 30 meters high dune is one of Alaska curiosities. There are 3 sets of dunes in the Kobuk Valley national park - Great Kobuk, Little Kobuk and Hunt River Dune that together cover 40 square km, and comprise the largest active Arctic dune field in North America.

Pingo is a mound of earth-covered ice. Frozen water creates it. These terrain forms are created in areas of long-term permafrost. Most of them lie in the Mackenzie delta.

The tallest mountain from base to summit. Using that measurement, Denali is taller than Mount Everest. Denali rises about 18,000 feet (5,500 meters) from its base, which is a greater vertical rise than Everest's 12,000-foot rise (3,700 meters) from its base at 17,000 feet (5,200 meters). But Denali and Everest are both dwarfed by Mauna Kea in Hawaii. When measured from the ocean floor to its summit, that mountain is 33,476 feet (10,204 meters) tall. However, only 13,803 feet (4,207 meters) rise above sea level.

The Aleutian Islands lie between Russia and Alaska.