From genteel townhouses to flamboyant skyscrapers, neo-classical temples to post-modern towers, New York boasts a dazzling array of architectural landmarks. A knowledgeable guide can take you to the most important structures, point out key details, and arrange visits to interiors. A tour might focus on Midtown Manhattan, Wall Street, one or more of the city’s historic districts, or a specific building. For example, the Merchant’s House Museum is a 19th-century house virtually unchanged for a century, inside and out. The first classical-style bank, designed by Stanford White, still stands. The Yacht Club, with its wave-shaped windows, is a marvelous example of mimetic design, even if the America’s Cup no longer resides there