Today marks what would have been Frank Lloyd Wright's 150th birthday, if he were still alive (he died on April 9, 1959). For casual fans of architecture, he's a household name; for architects, he's one of a small group of practitioners for whom it can be said redefined American architecture. (His attitude may be less admired—see editor-in-chief Ned Cramer's editorial in our June issue.)

Museums across the country are celebrating this anniversary of Wright's birth. At Fallingwater, visitors can indulge in birthday cake made from a favorite Wright recipe. (There will also be cake at the Guggenheim and the Bachman-Wilson House at the Crystal Bridges Museum of American Art, among others.) On Saturday, the National Building Museum in Washington, D.C., opens "Wright on the Walls," a collection of wall-mounted drawings designed to be colored by visitors. On Monday, the Museum of Modern Art opens the months-long exhibition, "Frank Lloyd Wright at 150: Unpacking the Archive," on view through Oct. 1. The Frank Lloyd Wright Foundation created a dedicated section of its website especially for the occasion, which includes event listings for Wright celebrations. Several Wright buildings are dropping tour fees to $1.50 for today. The Guggenheim will also have "an actor-historian portraying Frank Lloyd Wright" who will host two sessions about the design of the building. And of course, there's merch. HBD FLW!