This octagonal tower is both the national landmark of Lisbon and a World Heritage Site. Inside the tower there is a small expedition about its history as a setting off point for voyages of discovery to the Americas, and you can climb up the top for views of the Tejo river.
Avenida da India;
Tram 15 stops right in front of the tower but you have to cross the busy main road via a footbridge.
Updates
Well worth 3 euro for entry but avoid the rush when tour buses and schools arrive as single stair to the top is narrow and used for up and down transit - try first thing on opening 10 am (closed Monday).
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