Before visiting the graveyard at Lindholm Høje, it is worth visiting the excellent museum.
The new museum has a very informative central exhibit which will give you a good insight into the cultural, historical, and archaeological context of the site.
The museum also has a very nice cafe with an impressive view over the lowlands of North Jutland.
Here is one of the large ship-shaped Viking "graves" at Lindholm Høje. Actually, it is not a true grave, but a cremation site.
There are over 700 of these at Lindholm Høje.