My Favourite is probably the Bass of Inverurie which is now in the graveyard.
There's good evidence of the Neolithic & Bronze age around the natural mound that was then shaped into a motte. There are also Pictish carved stones in the graveyard.
http://www.undiscoveredscotland.co.uk/inverurie/bass/images/header-450.jpg
http://www.rcahms.gov.uk/pls/portal/newcanmore.details_gis?inumlink=18883#

Local to me is a natural hill that used to be known as 'the Silbury of the North', Freebrough hill
http://www.themodernantiquarian.com/site/1583/freebrough_hill.html

cheers
fitz