In Google Maps, find the Millennium Bridge (London) and double click on the bridge the center.
Click on the '192.com' toolbar button to see a detailed view (you can even see pedestrians standing on the bridge!). 192.com has pretty extensive coverage of the whole of the UK.
Click on the 'MultiMap' toolbar button to see a detailed map of the area.
In Google Sightseeing find and zoom in on the Eiffel Tower.
Click on the 'MultiMap' button to see a map of the surraonding area. The MultiMap site contains maps for all over the world.
Click on the 'Google Earth' to fly the Eiffel Tower in Google Earth (assuming it is installed).
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Find the San Francisco Bay Bridge in Google Maps and zoom in all the way.
Click on the 'Virtual Earth' button to view with MSN Virtual Earth. In this location you can zoom in another couple of levels.
Click on the 'TerraServer' button to view with Microsoft TerraServer. You can see the same data set being used as in MSN Virtual Earth.