On 8 September 2017 Portugal issued a set of four stamps plus a souvenir sheet to celebrate the selection of Cascais as the 2018 European Youth Capital. Cascais is a suburb of Lisbon and the location of Santa Marta Lighthouse which is featured on the stamp in the souvenir sheet shown below. The light serves both for general navigation and as a front range light. It dates from 1868.
Santa Marta L/H | Sc ?, Mi BL420, SG ?, Yt ?, WADP ? | 8 Sep 2017
Additional lighthouse stamps from Portugal are here
On 23 Sept 2016 Portugal issued a set of five stamps dedicated to Bridges and Engineering Structures. One of these stamps commemorates the 500th anniversary of the Tower of Belém. This stamp is very similar to to one issued on 1 July 2015 (see it here).
The second stamp shown below was issued on 10 Oct 2o16 and also features the Tower of Belém and is part of a set of four stamps commemorating the 500th Anniversary of Postal Service in Portugal.
Torre de Belém | Scott ?, Mi 4190, SG ?, WADP PT090.16 | 22 Sep 2016 - Image source: UPU http://www.wnsstamps.post/stamps/2016/PT/PT090.16.jpg
Torre de Belém | Scott ?, Mi 4193, SG ?, WADP PT093.16 | 10 Oct 2016 - Image source: UPU http://www.wnsstamps.post/stamps/2016/PT/PT093.16.jpg
View more lighthouse stamps from Portugal here