Dublin, Ireland, Dec 21, 2017 / 19:01 pm
The Celtic cross has been recognized as an emblem of Irish Christianity for centuries.
Today, the symbol is visible from thousands of feet in the air, greeting passengers who fly into the City of Derry airport in County Londonderry, Ireland.
More than 300 feet long and 200 feet wide, the cross is set on a hill, made of thousands of lighter trees amidst a backdrop of darker trees in Ulster forest.
While the cross has been visible for several years, its origins remained a mystery, until last year when Irish TV station UTV uncovered the history of the wooded cross.