Belém Tower (Torre de Belém) or the Tower of St Vincent is a fortified tower located in the civil parish of Santa Maria de Belém in the municipality of Lisbon, Portugal. It is an UNESCO World Heritage Site  because of the significant role it played in the Portuguese maritime discoveries of the era of the Age of Discoveries.(more: http://en.wikipedia.org/wiki/Bel%C3%A9m_Tower)