Stereoluchtfoto's van Amersfoort uit 1932
In July 1932 a plane flew over the Dutch city of Amersfoort and took 160 stereoscopic aerial photographs. Wessel Spoelder has pieced together 32 of these photographs and created this Google Maps mashup.
So if you have your 3D glasses hanging around after viewing Street View in 3D put them on and check out Amersfoort from above in 3D. If you know Amersfoort you can even search the map by street name.
This is another great Google Map from ab-c media weblab whose panoramic Street Views of churches in Utrecht is one of the most impressive maps I've seen this year.