Corinne Vionnet overlays tourist photos of well-known landmarks to create an intriguing effect. The central attraction is a bit fuzzy from the multiple layers of photos, as with this version of Stonehenge:
The other examples on her site — the Acropolis, the Taj Mahal, the Eiffel Tower, and more — have an even stronger presence of the crowd mingling in front of the destination. Because they are in so many layers, they look like ghosts, as with this one of Tianamen Square.
http://www.corinnevionnet.com/index.php?/photo-opportunities/
There are 24 in total on her website:
http://www.corinnevionnet.com/index.php?/photo-opportunities/