The Hoba Meteorite, found on a farm in Namibia in 1920, is the heaviest meteorite ever found. Weighing in at about 66 tons, the rock is thought to have landed more than 80,000 years ago. Despite its gargantuan size, the meteorite left no crater, which scientists credit to the fact that it entered Earth's atmosphere at a long, shallow angle. It lay undiscovered until 1920 when a farmer reportedly hit it with his plow. Over the years, erosion, vandalism, and scientific sampling have shrunk the rock to about 60 tons, but in 1955 the Namibian government designated it a national monument, and it is now a popular tourist attraction.