Expo Aichi 2005
I went to Expo 2005 in Aichi, which is a 2hr bullet train ride away - they don't tell you about the other 2rs of trains you need to take to get there though *sigh*.
It was ok, but I'm glad I didn't pay admission since there was no real "vibe" to it. There just wasn't much happening and the lines were huge - like 90mins for stuff. I checked out a few things, and unfortunately the Robot Station was for kids and pretty much sucked.
The Expo mascots sum up the bipolar nature of the experience nicely; "Let's eat some tiny slivers of pizza and half a can of coke"... "Grrr, that sucked and was $11".
One thing that was (literally) cool was a -30° room you could hang out in for $4.
Overall, it was good to help me realize how good Expo '86 actually was.