A polish river Wisla has the driest state, since many many years (about 50-100) different sources has different info... but the official one says it's 45,
you can simply walk on the bottom in a rubber shoes in some places...
Some sculptures, fountains, and door ornaments has been found. Signed by Dutchman sailors from 1650, they were probably travellin through the river, and when they were coming back... they simply sunk from overweight...
Everything is in a great shape and is priceless.. well, at least it seems to be, since it's quite old.
http://warszawa.gazeta.pl/warszawa/51,34862,12468235.html?i=0
Link to a photo gallery.
some of the pics below. 
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