It was pretty cool inside as well, especially when they displayed their aerospace technology. Here's a scale model of a Tupelov TU-144 - the Soviet supersonic transport aircraft (SST) that bore a striking (too striking?) resemblance to the French/British Concorde. The actual aircraft would not fly until several years after the fair.
Here is a selection of bitchin' Russian spacecraft and satellites. Is that vertical thing with the solar panels a space station of some kind? The smaller vehicle that is headed towards us is a Vostok spacecraft - nearly identical to the one that Yuri Gagarin flew in when he became the first human in space. The round part is the "capsule" in which the cosmonaut sat; it still amazes me that the Russian capsules land on the hard earth rather than in the ocean like the U.S. craft, and yet it seems to have worked pretty well over the years.
I've got lots more Expo '67 stuff, so I hope you enjoyed this post!