Google Siteseeing

Since Google aquired Keyhole, they have added a satellite photo feature to Google Maps, allowing easy navigation of locations across the world. While most of the high-quality photos are of urban areas in North America, the service has photos from all over the world at various altitudes.

The blog Google Siteseeing is a collection of satellite photos of famous landmarks taken from Google Maps. My favorite finds are the white house (which apparently has had its roof photoshopped), the washington monument and Oprah's likeness carved into foliage.