The Berardo Collection Museum in Belem is a wonderful place to see modern and contemporary art exhibitions (temporary and permanent). This is also just in front of the Mosteiro dos Jerónimos.
The Calouste Gulbenkian Foundation near the Eduardo VII Park is where you'll find works by Rembrandt, Monet, and Renoir. Don't miss the Modern Art Center, home to great contemporary Portuguese art.
Modern Art from Portuguese & International Artists of the 20th & 21st Centuries Read more.
Loads of books. Also a hidden mini art exposition upstairs and some sort of mechanics museum. Too bad all the books are in Portuguese.
Features a great Cinematic exposition with dozens of crazy mechanical machines created by the artist Pietro Proserpio.
Lisbon's most versatile livraria and is equal parts cafe, local art gallery, event venue, and bookstore. Pop in for an espresso, to buy a book, to look at art on both floors, or for a reading. Read more.
A must, if you like old art. Don't expect to find much information on the web. It is an old fashioned institution, stuck to the idea that culture must be printed on paper.