Follow the fossil route in Amsterdam
It seems that the city of Amsterdam is full of fossils. No, no, no, not old people, real fossils. Many of the stones used on doorsteps, bridges and streets contain fossils that are 350 million years old. Species such as brachiopods and crinoid starfish appear as odd white rings on a black stone background. A new book entitled De Amsterdamse Fossielenroute (‘The Amsterdam Fossil Route’) promises a tour of Amsterdam that doesn’t involve Rembrandt, although the new bridge at the Rembrandt House is apparently full of them.
(Tip: Laurent, via Het Parool)
There’s a site in English with more info at http://www.amsterdamfossils.com