While we've covered the tech of morbidity before, what we have in the U.S. is nothing compared with the Japanese. Since burials in Tokyo can be so expensive (topping out at more than $100,000), some people have invented a more conservative yet radical solution, according to the BBC: converting warehouses into high-tech graveyards.
Instead of one grave per a given area (like a house on a plot), the graves are stacked (like condos) several feet high. To give relatives access to the remains, a robotic arm retrieves the urn (most Japanese are cremated) and shuttles it to a "mourning room." Think of how a jukebox retrieves a record, only it's ashes.
It's a novel concept, but it's also uniquely Japanese, and we can't really see that catching on here. But it totally makes sense in hyper-dense Tokyo where land is scarce and getting out of the city really isn't an option for many people.