The late Bronze Age was a flourishing period or piledwelling settlements. The settlements grew in size and the villages remained in the same location for longer periods, in some case up to 100 years. Numerous amber and glass beads, finely decorated ceramics, elaborately crafted clothes pins and engraves bracelets have been found, indicating an increase in wealth. All this came to an abrupt end as a result of a cold phase that began in 850 BC. Thanks to the preservative properties of wetland soils and to scientific research, excavations have yielded an extraordinary wealth of information about prehistoric populations. These archaeological sites must be protected, for they have certainly not yet revealed all their secrets. They are not easy to visit because they are often lying at the bottom of lakes or buried underground. The most significant archaeological finds can however be seen in museums and parks.