What is shown in the picture?

Reminds me of the Flintstones.

Never heard of dolmens before. Quite interesting

Stonehenge is made up of dolmens.

Ivor Cockenballs, Looks more like a home for displaced hobbits.

Player #1147652, There is a dolmen near in in-laws home in Donegal and it looks exactly like the one on the left.

To the best of my known, they ere used to focus on a small group of stars which would hitherto be occluded by light such as the rising sun. The position of these star clusters would give early warning as to whether hunter/gathered should move due to seasonal requirements.

looks like stonehedge

Amazing to see in person, plenty dotted around Ireland. To think these were built 1000s of years ago without machinery.

oh I forgot orientation is fairly easy. you face your main door out of prevailing strong winds and for most light.

lo, I come from the West of England. My father an architect and amatuer historian said 'why does everyone get so excited about front doors!' If you build a house half underground of earth (cob) you put up stone door posts and lintels. It only makes sense. Watch the great BBC program Time Team, still available onYT. love

🇮🇪 has too many of them.

lots of these burial Chambers in my Country 🇮🇪 A Celtic burial chamber

Mythagoman, I'd have thought the weather would have been an easier indication

Reminds me of something from the Stone Age