Spain- Alhambra, Casa de Contratacion
Khmer- Angkor Wat
Persia -Apandana
England- Big Ben, Oxford, Stonehenge
Russia-Bolshoi Theater, Hermitage, St. Basils Cathedral
America- Broadway, Golden Gate Bridge, Panama Canal, Statue of Liberty
Rome- Colosseum
Greece- Colossus, Mausoleum of Halicarnassus, Oracle, Temple of Artemis
France- Eiffel Tower, Mont St. Michel
Brazil- Cristo Redentor, Estadio do Maracana
China- Forbidden City, Terracotta Army
Egypt- Great Library, Great Lighthouse, Pyramids
Aztecs- Huey Teocalli
Nubia- Jebel Barkal
Japan- Kotoku-in
Inca- Mach Picchu
India- Mahabodhi Temple, Taj Mahal
Hungary- Orszaghaz
Germany- Ruhr Valley
Australia- Sydney Opera House
19 civs so far, out of 42. Not quite half, but close. Several wonders are in civs that haven't been revealed (Ottomans) or implemented (Maya) yet.