The Birds of Eden aviary in South Africa. It’s the largest free flight aviary in the world.The aviary is home to about 3500 birds representing more than 200 species (among them are budgies and cockatiels).“Be they ex-pets, or birds confiscated from zoos or irreputable breeders, most of the birds that arrive at Birds of Eden have a history of being caged in small environments.”
The Aviary at Sonnenberg Gardens (New York).The Peacock House – the only remainder of a five building aviary complex which housed 216 species of birds.
The garden of the island aviary (the royal palace of Aranjuez, Madrid).
Rick Garmon’s log cabin aviary.You can read the story on how the aviary came to be on Julie Garmon’s blog.
The Columbary at Schloss Schönbrunn in Vienna.It’s meant for pigeons/doves, but I think it would suit a budgie quite nicely.
Marmont Manor’s two story aviary.Only $24.5 million!(It also comes with a Tudor-style main home, caretaker’s cottage, carriage house, pool pagoda with a restaurant-style kitchen, sushi bar and teppanyaki station, 8 car garage, fully stocked lake, three dog houses that mirror the architectural style of the main home and a fire station, which is recognized by the Los Angeles County Fire Department.)