Vestige- a trace of something that no longer exists or is disappearing; a relic
Ex: The Shteinburgers managed to successfully adhere to Passover kashrut laws at their all-inclusive, goy-exclusive resort in Boca Raton, a vestige of suburban American Jewry in the 20th century. Every Passover, they would migrate down to Boca with the other Jewish families from their area. Legend has it if you peer up into the sky in mid-April, you’ll see a flock of big-beaked birds in white button down shirts desperately flapping one of their arms while gripping tight to their yarmulkes with the other. As they passed overhead, you could hear cries of, “Ow! My arm is getting sore! When are we going to be there!” and, “I’m hungry! Can we stop for a bagel?”