lalibrairie: The Oxford Union Library, Oxford, United Kingdom On the walls are Pre-Raphaelites murals, painted by Dante Gabriel Rossetti, William Morris and Edward Burne-Jones. It also has a unique clerestory (Wikipedia will tell you all about it here).
Lotus Flower ArtScience Museum in Singapore, architect Moshe Safdie. I love this building and its location. I specifically love the reflection of the building in the water. I like the lighting illuminating the building from below.