4. Blarney Stone (Blarney Castle, Ireland)
According to the legend, the one, who will kiss the stone, which is located in the castle of Blarney, will acquire the gift of eloquence. Each year about 400 thousand people, that would like to speak beautifully from around the world, touch the stone with their lips, leaving billions of microbes. Except the fact, that it is unsanitary, you have know that it also takes a lot of physical effort to kiss it, because the stone is hanging over one’s head.