Centre for Alternative Technology Machynlleth, SY20 9AZ, tel 01654 703743, fax 01654 702782. Well established and interesting for power, traditional construction, and recycling techniques.
Duisburg Nord Landschaftpark and the Emscher Park iba Emscher Park, tel 00 49 172 280 9899. Worth a long weekend trip to see a whole industrial region being transformed. If you go, also see nearby Insel Hombroich 'Kunst parallel zur Natur' (41472 Neuss-Holzheim, tel 0049 2182 2094) for its marshland restoration, art collection in the countryside, gardens and permaculture farm.
Painshill Park Painshill Park Trust, Portsmouth Road, Cobham, Surrey KT11 1JE, tel 01932 868113. The most comprehensive and challenging historic landscape garden restoration.
wwt/The Wetland Centre The Lodge, Queen Elizabth Walk, Barn Elms, London SW13 ODB, tel 0181 876 8995, email mary dowling@wetland centre.org.uk. Now a major bird and wetlands centre, opening in May 2000.