The Nash Ramblas application, or app, lets users navigate via their iPhone the famous 2km leafy stretch of stuccoed Georgian terraces designed by John Nash.
Royal Parks teamed up with English Heritage, Crown Estate, RIBA London and technology firms AIG and Electric Mapping Co to offer archive images and information.
It takes users on a fact-packed annotated tour along the route's key landmarks as part of London's Festival of Architecture that took place in early July. The route is seen as one of the world's most elegant thoroughfares, winding through Regent's Park and St James's Park.
The app is free to download and navigates more than 30 sites taking in London's most iconic spaces and buildings including the Royal Parks and Trafalgar Square. The app gives details on events, talks, installations and exhibitions in the West End throughout the festival.
Tamsie Thomson, RIBA London director, said: "The application will provide a unique, intimate insight into the genius of John Nash."