This is the large tomb with a smaller one in front.
Here is a different small one.
The site at Newgrange is the most famous. After its use some 5000 years ago it was sealed until the passages and chamber were rediscovered in 1699. Much of the material inside Newgrange has been lost. In the 1970s, there was an attempt to rebuilt the dry stone rock walls in a way that they might have looked 5000 years ago.
This is the entrance to the passageway. There is only one passageway that has been discovered at Newgrange. The passageway is 60 feet long and leads to a large chamber that has a high vaulted ceiling, The chamber is 20 feet high at its central point. The guide pointed out that we were standing under one of the oldest human-built roofs in the world and after 5000 years, it still does not leak! There are three smaller chambers off the main chamber each with a large flat basin stone where the bones of the dead were laid. Newgrange is referred to as a passage tomb, but perhaps temple is a better description. The passageway is aligned with the rising sun on the winter solstice so that as the sun rises, the light gradually moves down the passageway until it reaches chamber. This must have been a place of spiritual and religious significance.
Note the opening above the door. This 'roof-box' is where the sun shines in illuminating the central chamber during the winter solstice.
Also notice the designs on the rock. These designs were created 5000 years ago. The interconnected spirals are amazingly complex.