The decision to open Raj Nivas, earlier called "Palais du Gouverneur" (Governor's palace) during the French regime, was taken recently by Lt Governor Kiran Bedi.
This is the first time that "one of the most important and well-maintained heritage buildings in Puducherry" has been made accessible for the public.
Normally, visitors are allowed entry into the campus only during occasions like Republic Day and Independence Day.
Bedi had been maintaining since she assumed office as Lt Governor on May 29 last year that "Raj Nivas is people's nivas and seva nivas."
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Officials of Raj Nivas accorded a warm welcome to the visitors. A brochure highlighting the history of Raj Nivas was distributed to each visitor.
The release also said a short film on Raj Nivas was screened with focus on its history and architectural highlights of the building.
The Lt Governor had recently launched the official website of Raj Nivas to ensure it becomes a bridge between the people and various departments for redressal of grievances.
Visitors can use the website rajnivas.Py.Gov.In to register their visits, the release said.