The Eldridge Street Synagogue, housing the exhibit, was also built in this fashion, perhaps inspired by the European shuls portrayed in the cards.Today known as the Museum at Eldridge Street, it was the first functioning synagogue built by Eastern European Jews in the United States, in Manhattan’s Lower East Side, which was once the main hub of Jewish life in the city.“This congregation was unusual in that it brought together immigrants from all over Eastern Europe, not just from one place,” Nancy Johnson said. “They all spoke Yiddish.”The building opened in 1887, to serve a flourishing community made of Jewish immigrant. By 1924, however, US immigration laws changed and cut off the arrival of most Jews from Eastern Europe. The Eldridge Street congregation started to shrink.When the Great Depression hit in the 1930s, it also begun struggling financially.“Whatever money the congregation had, they used to share with people who were struggling,” Johnson told the Post.The main space inside was too expensive to maintain and heat during the winter. The congregation stopped using it and it deteriorated over the years with holes in roof, leaks, stain glass falling out of the windows and birds flying around.It is only in 1986 that a professor who visited the abandoned synagogue initiated its restoration. Twenty years and $20 million later, the process was completed.Even though the congregation is very small and sometimes struggles to form a minyan, the Orthodox synagogue is functioning. After the space was fixed, it was granted museum status and today hosts various exhibitions, building tours, concerts and festivals.Several shuls on Banyai’s postcards have undergone a restoration as well. This common aspect was one of the reasons Johnson and her team decided to host the “Lost Synagogues of Europe” exhibit.“It was also a way to see into the minds of the early congregants and what they may have worshiped before they came here, or what the architects, who were German-born, may have seen to influence their decisions here,” Johnson said.The exhibit is a reminder of just how much was lost in the Holocaust, she said.“It’s harrowing,” Johnson said. “Everybody knows about World War II, everybody knows about Kristallnacht, but to see places that don’t exist anymore because of this, and then to think about the people who would have been associated with those places, it’s just incomprehensible.“When we first put the show up in the spring, there had been a number of antisemitic acts in the city, and it was kind of scary,” she added, looking at one of the panel of postcards. “In a way you look at this and you think this would never happen again, but then, maybe it could happen again. You can’t just be passive about it.”