1. The Blarney Stone in Ireland where mouths from all over the world touch the stone each year.
2. Seattle's Wall of Gum where, since the 1990s people have been depositing their masticated gum, resulting in a colourful although disturbing sight.
3. Oscar Wilde's Tomb in Paris, which has a rainbow of hundreds of visible kiss marks adorning the grave.
4. St. Mark's Square in Venice is full of hungry pigeons that are often touched and petted by tourists.
5. Forecourt of Grauman's Chinese Theater in Hollywood where people get down on their hands and knees to place their fingers in the moulds of their favourite stars.