Compare portal and passage tombs. What is one thing these tombs have in common?

Both consist of a passageway to a burial chamber.

The purpose of both of them is still a mystery.

Both are constructed with several upright stone blocks with a capstone placed over them.

Both are types of dolmans.

One thing these tombs have in common is that they were both used for burial purposes and were built using large stone slabs. Additionally, both types of tombs were often constructed in strategic locations and may have had important religious or spiritual significance to the people who built them.