It is in Manhattan, New York, and was finished in 1897, twelve years after Grant had died. It is the largest tomb in North America. Reputedly, over a million people attended the dediction ceremony and associated parade.
Over a period of decades, the tomb declined into a state of severe disrepair, and was considered by many to be an eyesore. Eventually renovation work was done on it, completed in 1997.
A riddle relating to Grant's Tomb, popularised by Groucho Marx, is "Who is buried in Grant's Tomb?". The traditional answer is "Nobody" - although Grant and his wife are interred in the Tomb, their coffins were laid on a raised platform, not buried.