"Show some respect. That's the message family members of those who died in the terrorist attacks on the World Trade Center have for tourists they say are treating the National September 11th Memorial like a "Disney attraction." One week before New Yorkers will gather to mark the 11th anniversary of 9/11, the New York Post reported that visitors to the year-old memorial are treating the somber site as a playground or a picnic area. The newspaper said visitors have been seen splashing water from its two huge waterfalls to cool themselves off and have placed their children's derrieres on the bronze engraved names of the dead..."
http://www.huffingtonpost.com/2012/09/04/911-memorial-treated-like_n_1855559.html
I lived for years in Berlin, where a Holocaust memorial in the middle of the city, designed by Peter Eisenman, consists of a checkerboard field of concrete plinths, a metaphoric graveyard. After it opened, the memorial became a magnet for young bicyclists and skateboarders who wove among the plinths, and sunbathers, German and otherwise, who tanned on top of them. Horrified authorities beefed up security.