Only in New Orleans, which is unique in so many ways, could cemeteries be major tourist attractions. However, because the city is built on a swamp, the deceased have to be buried above ground here in elaborate stone crypts and mausoleums. Over time the cemeteries, with elaborate sculptures and other decorative artwork embellishing the tombs, have come to come to resemble small villages. They are known by the nickname of "Cities of the Dead."