Aid agencies have marked the second anniversary of the 2010 Haiti earthquake by announcing details of a new fundraising and awareness initiative.
It is hoped 'Haiti Week' will raise around €10m.
Haiti's President Michel Martelly will make his first visit to Ireland as part of the event.
Two years after the earthquake there are few signs of rebuilding in the Western Hemisphere's poorest country.
The National Palace, parliament and other major buildings are still in ruins, hundreds of thousands displaced by the disaster still live in squalid tent camps, and a cholera epidemic has killed nearly 7,000 people since 2010.
UN chief Ban Ki-moon paid tribute to those who died, including more than 100 UN personnel, and called on international donors to keep up their "vital support" for the rebuilding two years after the disaster.
"Despite considerable achievements, including in the areas of rubble removal and the resettlement of displaced persons, many Haitians remain in need of international assistance," the UN said.
The US Agency for International Development (USAID) has been lending a hand, both with the removal of rubble and housing the displaced.
The agency claims to have helped reduce the number of homeless from 1.5m just after the earthquake to 500,000 today.
"That's still too many," said Mark Feierstein, USAID assistant administrator for Latin America and the Caribbean.
"You can't take the poorest country in the world, devastated with an earthquake, and expect to rebuild it in one year or two years."
In the small northern town of Limonade a university campus built with help from the neighboring Dominican Republic stands out as one of the few reconstruction projects to have been completed.
There are three plans for rebuilding downtown Port-au-Prince, one of them prepared by the Prince Charles Foundation.
"We will merge the various proposals and propose a final version for the reconstruction of the center of the capital," said Adam Arry, the optimistic newly appointed director of Haiti's reconstruction.
"Construction projects for housing are under way and others will soon be launched," he told AFP.
