Mammoths and Pyramids. This fact is pretty hard to believe as most mammoths died out around 10,000 years ago. However there was one place, Wrangel Island off the coast of Russia, where an isolated population of mammoths lived until 4,000 years ago. The Great Pyramid of Giza was built over 4,500 years ago which means mammoths still walked the earth when the great pyramid was being built. Pyramid Source Mammoth SourceWeirdFactMammothsAroundWhenPyramidBuilt