According to this website (
http://www.theneverlandfiles.com/tnf/disneyworld/epcot.php) this is the list of proposed pavilions over the years.
Brazil Pavilion
A Brazilian pavilion for World Showcase developed by Claude Coats.
Costa Rica Pavilion
A Costa Rica themed pavilion for World Showcase.
Denmark Pavilion
1983 plans for a Denmark Pavilion would have been based on Tivoli Gardens and included a Ferris wheel, carousel and a canal ride through Lego miniatures of world landmarks. Later 1994 plans were all but signed, but ultimately fell through.
Equatorial Africa Pavilion
An African themed pavilion for World Showcase. Many elements later appeared at Disney's Animal Kingdom.
Iran Pavilion
An Iran themed pavilion for World Showcase, with a dark ride through Persian history inside a replica Golestan Palace, and bazaar shopping area. Cancelled when the Shah of Iran lost power to the Islamic Fundamentalist Regime.
Israel Pavilion
An Israel themed pavilion for World Showcase. Possibly abandoned due to security worries.
Movie Pavilion
A ride based on Hollywood movies, that later evolved into Disney's Hollywood Studios theme park.
Netherlands Pavilion
1982 plans considered the addition of a Netherlands Pavilion, which eventually lead, via the possibility of Denmark and Scandinavia Pavilions, to the Norway Pavilion.
Philippines Pavilion
A Philippines themed pavilion for World Showcase, developed by Claude Coats.
Poland Pavilion
Artwork for a Polish pavilion with a distinctly Eastern European look was shown at an Art of Disney Architecture exhibition.
Project Gemini
A plan to retheme and reinvigorate Future World as Discoveryland, with Time Racers rollercoaster, rainforest rollercoaster, and numerous other projects.
Scandinavia Pavilion
1983 plans for a Denmark Pavilion lead to the development of a Scandinavia (or Nordic) Pavilion covering three countries before the focus was narrowed to produce the 1988 Norway Pavilion.
Soviet Union Pavilion
A Russian themed pavilion for World Showcase, featuring a recreation of St. Basil's Cathedral.
Space Pavilion
An entire Space Pavilion was considered for after Mission: SPACE. Guests would be aboard a three story space station, with a space walk ride weaving amongst it.
Spain Pavilion
A Spain themed pavilion for World Showcase.
Switzerland Pavilion
A Switzerland themed pavilion for World Showcase, including a west coast version of the Matterhorn Bobsleds.
United Arab Emirates Pavilion
A United Arab Emirates themed pavilion for World Showcase.
Venezuela Pavilion
A Venezuela themed pavilion for World Showcase including an aerial tour above a rainforest and a waterfall restaurant.
:shrug: