Public Spaces listed the museum among the "Great Public Spaces in the World" in 2005. In 2002, financial obligations forced Cassilly to begin charging visitors a fee to park at the museum. Cassilly hung a sign in the museum's parking lot reading, "Greedy Bob’s Parking Lot." Cassilly's other works include hippopotamus statues installed at Hippo Playground in Manhattan's Riverside Park in 1993. In 1997, Cassilly also contributed hippo sculptures to Central Park's Safari Playground near W. 91 Street. He designed two turtles for Turtle Park in St. Louis. A giant concrete butterfly, called the Mysterious Monarch, was unveiled in Faust Park outside the Butterfly House, Missouri Botanical Garden in 1997 in Chesterfield, Missouri. Cassilly's giraffe statue, which stands at the entrance to the Dallas Zoo, is the tallest sculpture in Texas at 67½ feet tall. His works for the St. Louis Zoo include the Sea Lion Fountains and a 45-foot squid statue. In 2000, Cassilly began work on Cementland, a repurposing of a former cement factory on a site in north St. Louis. In 2002, Cassilly and Soliwoda divorced. Commissioned sculptures 1987-1989 dinosaur for Planet Hollywood West-end in Dallas. "Big-Tex Rex" now resides in Amarillo, Texas, at the Big Texan Steak Ranch 1987: Marlin Perkins bust at the St. Louis Zoo 1991: Six lighted entry markers at the St. Louis Galleria 1993: Hippo playground sculptures in Manhattan's Riverside Park 1996: Turtle Park sculptures in St. Louis' Forest Park 1997: Hippopotamus Park statues at Central Park's Safari Playground in Manhattan 1997: Giraffe statue at the Dallas Zoo 1998: Mysterious Monarch and Lopatapillar at Faust Park in Chesterfield, Missouri 1999: Sea Lion Fountains at the St. Louis Zoo Dinosaur at Dallas Planet Hollywood Ruins at Roman Rapids ride, Busch Gardens Virginia Apple chairs, Webster Groves, Missouri 1999: Musical Lion Benches, University City, Missouri Death On September 26, 2011, Cassilly died at Cementland. A police investigation found that he died of injuries after the bulldozer he was driving flipped down a hill. Some members of Cassilly's family contested the results of the investigation and hired an independent doctor to review the evidence. He concluded that Cassilly was beaten to death, but the St. Louis medical examiner dismissed his evidence and stood by the ruling of accidental death. Cassily was survived by his third wife, Melissa Giovanna Cassilly, and their two children, Dylan and Robert III; and two children from his second marriage, Daisy