Gwern Einion is such a classic. If you picked it up and plonked it in Ireland no one would bat an eyelid. It's such a stereo-typical portal tomb. One of my favourites!

It's about half the size of Leac an Scail, though and looks totally different from other angles. The capstone is a fantastic starship-shaped thing. The resemblence from the angle in those photos is very good.