Natural sink hole in Limestone escarpment - Serra da Estrela Mountain, Portugal

Natural sink hole in Limestone escarpment - Serra da Estrela Mountain, Portugal

The train up the Douro River Valley. This is the only place in the world where port wine grapes grow, Portugal

The train up the Douro River Valley. This is the only place in the world where port wine grapes grow, Portugal

Portugal - Lisboa, Torre de Belém Photo by António Sacchetti - http://www.thirsty-cat.com/

Portugal - Lisboa, Torre de Belém Photo by António Sacchetti - http://www.thirsty-cat.com/

Penedono castle - Helena Fernandes  Beira Alta, Portugal

Penedono castle - Helena Fernandes Beira Alta, Portugal

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