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Illness, death, and posthumous honors

Geisel died of cancer on September 24, 1991, at his home in the La Jolla community of San Diego at the age of 87. His ashes were scattered in the Pacific Ocean. On December 1, 1995, four years after his death, University of California, San Diego 's University Library Building was renamed Geisel Library in honor of Geisel and Audrey for the generous contributions that they made to the library and their devotion to improving literacy.

In 2002, the Dr. Seuss National Memorial Sculpture Garden opened in Springfield, Massachusetts, featuring sculptures of Geisel and of many of his characters. In 2017, the Amazing World of Dr. Seuss Museum opened next to the Dr. Seuss National Memorial Sculpture Garden in the Springfield Museums Quadrangle. In 2008, Dr. Seuss was inducted into the California Hall of Fame. In 2004, U.S. children's librarians established the annual Theodor Seuss Geisel Award to recognize "the most distinguished American book for beginning readers published in English in the United States during the preceding year". It should "demonstrate creativity and imagination to engage children in reading" from pre-kindergarten to second grade. On April 4, 2012, the Dartmouth Medical School was renamed the Audrey and Theodor Geisel School of Medicine in honor of their many years of generosity to the college. Dr. Seuss has a star on the Hollywood Walk of Fame at the 6500 block of Hollywood Boulevard.

In 2012, a crater on the planet Mercury was named after Geisel.