The Colosseum in Rome and the Sacre Coeur church in Paris are among 120 new landmark sites going green for St Patrick's Day.
Some 60 major global sites have already confirmed they will take part in the greening project on March 17 and another 60 are expected to be added to the list shortly.
Other newcomers to the list include Nelson's column in London, Jumeirah Etihad Towers hotel in Abu Dhabi, the townhalls of Munich and Bamberg and the Christ the King statue in Lisbon.
The Grand Ole Opry house in Nashville - home to the show that made country music - will also go green for the first time as will Porte de Bourgogne in Bordeaux and the Fram polar exploration ship in Oslo.
The idea for greening buildings started in earnest in 2010 with the Sydney Opera House, which proved the inspiration for rolling it out all over the world.
Also going green will be Sleeping Beauty Castle at Disneyland Paris, Dubai's Burj al Arab, Rio's Christ the Redeemer Statue, the London Eye, Niagara Falls and Auckland's Sky Tower.