The Americans with Disabilities Act turned thirty-five years old with a strange reputation: everyone has heard of it, and almost nobody knows what it actually requires. This article explains the real architecture — five titles, three that matter to most people, and a set of standards that vary enormously depending on who owns the building and when it was built. It covers who counts as disabled under the amended definition, why that question almost never decides a case anymore, and what a business actually has to do about a step at its front door. It explains the difference between removing a barrier that is readily achievable and building to a standard, why an old building and a new one face completely different rules, and what the remedies are — including why most private access suits produce an injunction and a fee award rather than damages. Separate parts address service animals, effective communication, websites, and the integration mandate that governs services for people with disabilities. Examples run throughout, including a worked case showing how a single missing ramp becomes a federal lawsuit.