Grant's Tomb is a mausoleum that holds the bodies of Ulysses S. Grant, the 18th president of the Unites States and his wife Julia Dent Grant. It was designed by John Duncan and is the largest mausoleum in North America. It is made from 8,000 tons of granite, Italian marble trimmings, and Massachusetts marble floors and was opened in 1897. It is open 7 days a week and is almost never crowded. There is no charge to get in.