Dublin City Council has announced that Vilnius in Lithuania and Lublin in Poland have been added to the Dublin Portal network.
Originally set up as a video link between Dublin and New York, people will now be able to connect with people on the streets of the two eastern European cities.
The livestreams will rotate every 180 seconds.
The portal is active daily from 1pm to 8pm on North Earl Street in Dublin city centre.
Lord Mayor of Dublin James Geoghegan said they are "delighted" to see the network of cities expanded to Vilnius and Lublin.
"The portal in Dublin has attracted over 340,000 visitors since its launch in May and has brought a new lease of life to North Earl Street," he said.
The Vilnius Portal is positioned adjacent to the city's central station, and the Lublin Portal is located on the central city square, Litewski Square.
The portal between Vilnius and Lublin has been open since 2021 and was the first in the project of global portals.
Lublin city representative Beata Stepaniuk-Kuśmierzak welcomed the addition of Dublin and New York to their portal network.
"We can now peek into New York's Manhattan and Dublin's city centre, share culture, experiences and initiate new projects together," she said.
The incorporation of multiple cities into the portal realises the original mission of the project, to create a global artwork that invites people from multiple countries to meet in a spirit of unity.
Benediktas Gylys, founder of portals.org, said: "The mission is about building multiple portals, which together form "a global entity - a bridge to a united planet that invites people of distant cultures to meet above borders, differences and narratives.
"It took us eight years to arrive at this special day and we are grateful for the consistent support from our partners in Dublin, New York City, Vilnius, and Lublin."
