It's known as the House in the Loire, and it's a popular sight for those on Loire River boat tours. But it's not a house on a formerly dry site that later flooded; nor does anyone live there.
Researchers at Purdue University have managed to spin a very tiny object at the ungodly rate of 300 billion revolutions per minute - and it's powered only by light. Plus: Google Maps allows users to rate and review rivers, lakes and anywhere else that people want to go. So what's the best-reviewed river Earth has to offer?