An photograph of buildings in the New York skyline illuminating their windows with crosses for Easter has gone through several cycles of viral popularity over the years and is usually posted along with a claim that such a display would not be allowed in modern times:
The image is real and was taken shortly before Easter in 1956. One newspaper, the Oxnard Press-Courier, published the photo on 31 March 1956 with the following caption:
Huge crosses, formed by lighted windows, blaze above New York’s skyline as part of an Easter display in Manhattan’s financial district. This scene, photographed from the roof of the Municipal Building, features 150-foot-high crosses in the City Services Co., City Bank Farmers Trust Co., and the Forty Wall Street Corp. buildings. (United Press Telephoto)
As for the claim that this form of light display would cause an uproar today, it should be noted that Oklahoma City used building windows to depict crosses during the holidays as recently as 2010:
The Empire State Building also displays festive lights during religious holidays (red, green and white for Christmas, pastal fades for Easter, blue and white for Chanukah) and Chicago's Daley Plaza has featured a Nativity Scene since 1984.