Dating back to 1934, this art deco gem, the home of British architecture, lies behind an elegant Portland Stone structure. Walk through the large bronze doors into a spacious lobby, off of which you'll find a new museum-quality gallery showcasing architecture-related exhibitions. The Library is a research resource for all aspects of the profession while up the wide marble staircase is a gorgeous art deco restaurant. Guided tours of the building take place on the last Tuesday of every month. Places are free, but offered on a first-come-first-served basis (groups of five or more have to book).