Washington DC is a planned city. And I love me a bit of civic planning. Growing up in the UK, where cities are mostly accidents and mishaps thrust together into one mishmash of buildings and people, the idea of planning something from scratch is baffling. So for me, flicking through images of these neat, designed places is endlessly fascinating. Even sewerage plans.

If you happen to not have enough digital heritage content to look at (ha!) then you may want to see how The Smithsonian has placed 2.8 million high-resolution two- and three-dimensional images from across its collections online for everyone to see. There content there from all nine Smithsonian museums, nine research centres, libraries, archives and the National Zoo. This year they intend to put another 200,000 images online.

I wonder if the grand plan is to digitise all 155 million items? That might be too much heritage content even for me. But it can remind me of the order and neat arrangement of Washington each time I look at it.