A beautifully, wonderful repository of things found beneath the surface of rivers & canals of Amsterdam, as they were building the North/South metro line.
It's such a wonderful resource, especially the fact it's a public resource developed by the city of Amsterdam, itself.
The excavations in the Amstel yielded a deluge of finds, some 700,000 in all: a vast array of objects, some broken, some whole, all jumbled together. Damrak and Rokin proved to be extremely rich sites on account of the waste that had been dumped in the river for centuries and the objects accidentally lost in the water. The enormous quantity, great variety and everyday nature of these material remains make them rare sources of urban history.
There's the photographic resource, documenting all the objects...then! the actual published research for anyone to read in English and Dutch of everything they found.