The Belem Tower (Torre de Belem), Lisbon, Portugal. At the margins of the Tejo river, it is an iconic site of the city. Originally built as a defence tower, today it is used as a museun. Shutterstock Image - The Belem Tower (Torre de Belem), Lisbon, Portugal. At the margins of the Tejo river, it is an iconic site of the city. Originally built as a defence tower, today it is used as a museun. - ID: 716538976