Agatha Christie lived in several places throughout her life, but her most famous residence was Greenway House, located on the River Dart near Galmpton in Devon, England. She bought this Georgian estate in 1938 as a holiday home and referred to it as "the loveliest place on Earth." The house was not primarily a place of work but a retreat where she relaxed and found inspiration for her books. She and her husband Max Mallowan lived there until their deaths, and it was also home to her daughter Rosalind Hicks for many years. Today, Greenway House is owned by the National Trust and open to the public.

In addition to Greenway, Agatha Christie had several other homes throughout her life, including an apartment in London and her childhood home in the Devon countryside near Torquay, which she cherished deeply.

In summary, key places Agatha Christie lived include:

• Greenway House (Devon) - holiday home and major residence later in life
• Childhood home near Torquay, Devon
• Various houses and apartments in London

Greenway House remains the most iconic and is preserved as a museum today.