Google Panoramio

Microsoft's Photosynth is very good - it allows you to “pass” various places of light, “sticking together” thousands of photos of various users, thereby turning into a 3D model of the real world. Until today, only Windows users had this feature.

Panoramio is a Spanish startup that Google bought a year ago, in May 2007. Today, the service launched a new “Look Around” feature, reminiscent of a simplified Photosynth, but no less impressive.
The technology is implemented on a flash, so you can try it from any OS.

The resource combined high-resolution photos (mainly architectural monuments, squares) and thus created a “review” album - you can look at the buildings from almost any angle.
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Panoramio, moreover, is indexed and updated every 2 weeks, so soon you will be able to see almost any place on the planet where the human foot was.