Guidonia Montecelio is a city and comune located in the Metropolitan City of Rome, in the region of Lazio, Italy. It is situated approximately 30 kilometers northeast of Rome and is known for its picturesque landscapes and historical sites. The city is divided into two main areas: Guidonia, which is the modern and more urbanized part, and Montecelio, which is the historic and more rural area. Guidonia is characterized by its bustling city center, with shops, restaurants, and cultural attractions, while Montecelio is known for its charming medieval streets and ancient architecture.