Historical time line is built with the contribution of several factors such as the monument itself and the cultural landscape stitching together several years and binding various communities. The attributes of a clan are recognized by evidences left by them over a period and its effect upon a region gleaned with the help of its impact felt through the dissemination of arts and the extent of that particular type of architecture. The state of Maharashtra has a rich cultural tradition in architectural medium and can boast of hundreds of hundreds of rock –cut caves, sea forts, hill forts, temples etc. dating back from the pre-Christian era to the late medieval period.
After bifurcation of Aurangabad circle, the Mini circle Mumbai started functioning with effect from the 1st December, 2004 and now, become the Mumbai Circle on 28th December, 2005 with its Head Quarter at Sion Fort, Sion (E), Mumbai. This Circle having a total 117 monuments has its jurisdiction over eleven Districts namely Kolhapur, Mumbai City, Mumbai-Suburban, Pune, Ratnagiri, Raigad, Sangali, Satara, Sindhudurg, Sholapur, and Thane,of Maharashtra. There are eleven Sub-Circles located at Alibag, Elephanta, Janjira, Junner, Kolhapur Mumbai, Pune, Sholapur, Raigad, Vasai aand Vijaydurge.
Among the above monuments “Elephanta caves” has been inscribed in the World Heritage List in the year 1987 by UNESCO. The others monuments comprise Buddhist Rock-cut caves (as a Kanheri, Bhaja, Bedsa, Karla and Kondane etc.) Buddhist bricks built stupa at Nala-Sopara, Hills fort at Shivaneri, Raigad, Lohgad etc. and Sea Fort at Kolaba (Alibag), Sindhudurg, Jaigad, Suvarnadurg etc., Temples at Ambarnath, Bhuleshwar, Velapur etc. besides Portuguese remains at Vasai (Bassein), Sion etc.