The 15-metre-high arch is one of the few remaining parts of the Temple of Bel in the Syrian city. It was almost completely destroyed by ISIS militants as they systematically destroyed Palmyra over the past year.
The construction of a replica will be the centrepiece of a series of events around World Heritage Week, planned for April, with a theme of replication and reconstruction, The Guardian reported.
It has also been characterised as a gesture of defiance against attempts by religious extremists to erase the pre- Islamic history of the Middle East.
Founded in AD32, the Temple of Bel was consecrated to the ancient Mesopotamian god Bel and formed the centre of religious life in Palmyra.
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Known as the Pearl of the Desert, Palmyra - which means city of Palms - lies 210 km north-east of Damascus. Before the Syrian conflict erupted in 2011, more than 150,000 tourists visited the city every year.
Building a copy of the temple's entrance arch has been proposed by the Institute for Digital Archaeology, a joint venture between Harvard University, the University of Oxford and Dubai's Museum of the Future that promotes the use of digital imaging and 3D printing in archaeology and conservation.
In collaboration with UNESCO, the institute earlier this year began distributing 3D cameras to volunteer photographers to capture images of threatened objects in conflict zones throughout the Middle East and north Africa.
The images are to be uploaded to a "million image database" that, it is hoped, can be used for research, heritage appreciation, educational programmes and eventually 3D replication - including full-scale rebuilding.
Alexy Karenowska, the IDA's director of technology, said the renderings would be used to recreate the arch through a combination of 3D printing computer-controlled machining techniques.