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The Glacial Valley of Zêzere`s River, Portugal, is integrated in Serra da Estrela Natural Park, located in the largest mountain range in Portugal, and extends along 13 kms (8 miles) of incomparable geological beauty.
It was considered one of the 21 natural portuguese wonders.
Its shape is in `U`, and it`s one of the biggest glaciar valleys in Europe.
Shows the traces of glaciation of thousands of years ago.
It`s something that worths to see.
Hope you like!
Pic 1- Source Link
Pic 2- http://aboutportugal-dylan.blogspot.pt/2008_11_24_archive.html