New York has long held a place as the nation's most admired and reviled city, provoking more debate, affection, and curiosity than any other. Generations of visitors and residents alike have pondered the city's enduring quirks and unusual traditions. In the F.Y.I. column in , the paper's reporters and editors turn their talents to answering readers' most perplexing queries about the city, some of which include: Where was the World Trade Center originally going to be located? Where was the last opium den in New York? Is there a secret tunnel linking Police Headquarters to a nearby tavern? What was the busiest day in subway history? Is there really a Main Street in Manhattan? What was the Street of Brides? Amply illustrated with Stuart Goldenberg's whimsical cartoons, and with an introduction from Constance Rosenblum, editor of the 's City section, is sure to generate laughter, delight, and "Aha!" reactions in anyone who has ever been stumped by one of Gotham's countless oddities.