sentences:  Others disagreed.A 2009 retrospective of Frank Lloyd Wright at the original building in New York showcased the architect on the 50th anniversary of the opening of the building and was the museum's most popular exhibit since it began keeping such attendance records in 1992.In 2001, the foundation opened two new museums in Las Vegas, Guggenheim Las Vegas and Guggenheim Hermitage Museum, both designed by architect Rem Koolhaas.