If the Outstanding Universal Value of a site is threatened by natural disaster, armed conflict or unchecked development, the site may be inscribed on the World Heritage in Danger list.

UNESCO: Becoming a World Heritage Site

In order to be inscribed on this list, States must pledge to implement special protection plans, established with the full participation of concerned communities.

UNESCO: CULTURE

The names of the 300 New York City firefighters, and the names of others who died in the line of duty in 2001, will be inscribed on the monument at next year's ceremony.

CNN: Bush speaks at service for fallen firefighters

He added that the stadium's 27-tonne bell was being cast on Friday at London's Whitechapel Foundry - where 13.5-tonne Big Ben was cast in 1856 - and would be inscribed with a quote from The Tempest's Caliban: "Be not afeard, the isle is full of noises".

BBC: London 2012: Isles of Wonder theme for Olympic ceremony

Another aspect of Module 6 is the raising of awareness about natural areas in the Caribbean which could potentially be inscribed on the World Heritage List.

UNESCO: MEDIA SERVICES

"I'd like to ask, please, to anyone who is in charge of the economy, politics, society to all men and women of good will let's be custodians of creation and of the design of God inscribed in nature custodian of others and of the environment, " the pope said.

WSJ: Pope Celebrates Inaugural Mass

Please, I would like to ask all those who have positions of responsibility in economic, political and social life, and all men and women of goodwill: let us be "protectors" of creation, protectors of God's plan inscribed in nature, protectors of one another and of the environment.

CNN: Text of Pope Francis' homily

Once inscribed as a World Heritage Site, the site must then be preserved, maintained and presented in accordance with a management plan.

UNESCO: Becoming a World Heritage Site