From the 1940s through the 1960s, this shack was Mary’s Snack Bar — better known as Mary Spaghetti’s — run by Mary Souza. Open until 3 a.m., it was a popular rendezvous with “night prowlers,” as The Advocate put it, and anathema to the neighbors. Among the night prowlers once — it is said — were Elizabeth Taylor and Richard Burton. Mary’s claims to fame were clamburgers and pepper steak, but the name of the joint suggested another specialty of the house — besides general uproar. Kim Oliver of Provincetown Florist, who owns the property, replaced the tumbledown shack with a Cape-style cottage in 2011.