The canals of Amsterdam have been winding their way through the city for 800 years. Construction of a new metro line made it necessary to clean them out, and an amazing variety of items have been dredged up from the bott...

The cultural center Doornroosje in Nijmege, Netherlands, has been the site of lots of graffiti and street art since it was built. Paul DeGraaf calls it a "graffiti hall of fame." He noticed a spot where the paint had fal...