Venus, the second rock from the sun, is often considered Earth's twin since it's similar in size and mass. The similarity ends there. A day on Venus is almost four months long and if you could stand on the molten hot surface and see through the clouds the sun would rise in the west and set in the east, it actually rotates in the opposite direction of all the other planets.
A view in visible light of the clouded surface from the Mariner 10 flyby showing subtle bands in the thick atmosphere.
Venus has been visible to the unaided eye as a bright star near the horizon just before sunset and just after sunrise since the begining of time.