Yeah Portuguese lands are not well known. As you said most of the tourists go down south to the Algarve region. It's definitely not the area I prefer, it doesn't look Portuguese if you know what I mean. Evora for example is one of the most beautiful Portuguese city but only Spanish tourists go there (it's 1h far from the boarder)
A couple of years ago my gf and I drove all along the coast from Coimbra to Faro. We discovered a small village called Odeceixe and we decided that we would retire there if we ever have a chance to retire one day. To get there you must leave the main road from Lisbon, take a small road and follow the river and there you are: a small village with a very small beach stuck between two cliffs and a mix of pure water from the river and salt water from the sea. Best place on earth.
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