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A few weeks ago we took a look at some of the most bizarre buildings we’ve ever seen: the strange Soviet architecture that emerged during a fascinating era of extreme artistic inquiry fueled — as so many are — by social revolution. Now that we’re officially obsessed with far-out retro-future design, we literally fell off of our chair when we came across the progressive pavilions built for two World Expos that we would have loved to attend. From a building that looks like a giant blue Jell-O mold to a larger-than-life paper forest, click through to take a quick virtual tour of some of the most incredible structures we’ve ever seen.

The New York State Pavilion from Expo 67 – Montreal, Canada

Canadian Pulp and Paper Industry Pavilion from Expo 67 – Montreal, Canada

Ontario Pavilion at Expo 67 – Montreal, Canada

The Vienna Kindergarten at Expo 67 – Montreal, Canada

Man and Color Kaleidoscope at Expo 67 – Montreal, Canada

Man in the Community at Expo 67 – Montreal, Canada

Takara Beautilion Pavilion at Expo 70 – Osaka, Japan

Toshiba-IHI Pavilion at Expo 70 – Osaka, Japan

Midori-Kan Astrorama at Expo 70 – Osaka, Japan

Gas Pavilion at Expo 70 – Osaka, Japan

Telecommunications Pavilion at Expo 70 – Osaka, Japan