banhocheiroso

One of the strangest things in Belo Horizonte - Peanut Road. If you stop your car on this (apparent) gentle down-slope, and let the brake off in neutral, it will roll slowly backwards. The effect is quite stunning. The fact that the hill on which the road is built is so full of iron ore that the rocks look more like metal lumps than ordinary stone leads to one popular explanation: magnetism. But it hardly deals with the fact that (apparently) water also flows "uphill" here. A better explanation is an extremely sophisticated and general optical illusion - no true horizon is visible, and the surrounding topography makes for a very consistent sense of a downward slope where the reverse is in fact the case. See http://www.absoluteastronomy.com/reference/gravity_hill