The UNESCO World Heritage site near Mexico City is a pre-Columbian city known for its impressive culture and architecture.
The urban revitalisation of Rambagh Gate and Ramparts in Punjab also won the 'Award of Excellence' at the event.
It will be open as the India Art, Architecture and Design Biennale (IAADB) is held here till December 15.
Three solar power plants having a capacity of 10 kilowatts have been installed to meet its energy needs.
UNESCO officials have emphasised that a downgrade is not meant to be punitive but to alert the world community that more needs to be done to address issues plaguing a World Heritage site.
Footage shared online, but not verified by Reuters, shows cracks and fallen rubble at a section of the medieval walls and a collapsed minaret.
The train will be introduced under the new concept named 'Heritage Special.'
Coastal tourism is the main attraction of the archipelago, which has a World Heritage Site named 'Stone Town.'
Kerala is famous for its palaces, forts, stone caves, tombs, shrines, and many other unique architectural features of the state.
Bekal Fort, a key-shaped structure two-thirds of which juts out into the sea, is a major tourist attraction and a protected monument under the ASI.