The list of top board games for adults is long to the point of exhausting. Here some perennial favourites: Cranium, Settlers of Catan, Pandemic, Betrayal at the House on the Hill, Risk, and Clue.
A list of the best (or at least the most iconic) board games of all time might look like this: Chess, Monopoly, Scrabble, Risk, Stratego, Battleship, Settlers of Catan, Clue, Pictionary, and Sorry.
The oldest board game known to man is called Senet and it's been found in ancient Egyptian burials dating back to around 3100 BC.