The remains of American Civil War general and US President Ulysses S. Grant and his wife, Julia Dent Grant, lie interred in Grant's Tomb. The granite and marble structure, designed by architect John Duncan, was completed in 1897 and dedicated on what would have been Grant's 75th birthday. The tomb complex is located in New York City's scenic Riverside Park. A major restoration by the National Park Service was completed by its centennial. What did Duncan use as a general model for his design? Discuss (http://forum.thefreedictionary.com/postst57316_Grant-s-Tomb-Dedicated--1897-.aspx)