Wall Street was a financial center on Earth until the planet abandoned currency-based economics. It was located in New York City during the 19th, 20th, and part of the 21st century. At Chimney Corner, it intersected Broadway. (TNG: "The Big Goodbye"; DS9: "In the Cards")
A major newspaper, the Wall Street Journal, was named after the street. (TNG: "The Neutral Zone")
Though its importance had long since passed out of relevance, the Ferengi who first visited Earth treated Wall Street with great reverence akin to a sacred site. The economically-obsessed species would often visit Earth to make pilgrimages there. (VOY: "11:59")