Odaiba is an island area in Tokyo Japan accessible by a monorail. It was one of the most fun adventures I had in Tokyo (and there were a lot!). Every stop on the Odaiba Monorail had some great architectural attraction.
The Island is actually artificial, built to protect Edo from the Americans at the end of the Edo Period. It didn’t work, so Japan was forced to open itself to the world, exporting woodblock prints to Europe which would help to unleash impressionism. But more about that later, here are a couple sights on Odaiba:
Fuji TV building with its giant spherical nodule.
Tokyo Big Site, conference centre that looks like an upside down pyramid.