Visitors to the Australian War Memorial will have the chance to commemorate Australia's war dead after dark throughout January.
While the galleries still close at 5pm, the Commemorative Area will reopen from 7.30pm until 10pm on Fridays and Saturdays.
Volunteer guides will tell stories about those listed on the Roll of Honour who died during, or as a result of, war service.
People can also listen to recordings of these names being recited by Australian children.
A spokesman for the War Memorial said the late night openings of "the heart of the Australian War memorial" had become a tradition and hoped they would continue.
"There is a particular focus on commemorating the First World War (1914-18) as it is 100 years since it took place," he said.
"This year marks the anniversary of Australia's arrival on to the battlefields of the Western Front, which would ultimately be the most disastrous fighting our nation has ever experienced."
The late night openings will occur alongside the names of Australians who gave their lives during World War I being projected on to the dome above the Memorial's Hall of Memory.
"The projections [which start at 9.22pm] commenced on August 4, 2014, and will run until November 2018," the spokesman said.
"The name of each of the 62,000 Australians listed on the First World War Roll of Honour panels will be projected on to the building. Each name will be projected approximately 15-20 times over this period."
Entry to the late night openings is free.