(CNN) -- They scream germs: Used gum. A flock of pigeons. A tomb covered with kisses.
The Blarney Stone in Ireland received more than 400,000 visitors in 2008, many who kissed the lucky stone.
These bacteria-infested attractions have topped an unusual list compiled by editors at TripAdvisor.com, a travel advice Web site. This summer, editors at the site named the five "germiest" tourist spots in the world.