Located in the "Heart of Neolithic Orkney" Unesco World Heritage site, the Maeshowe Chambered Cairn is said to be the "finest" surviving Neolithic building in Northwest Europe.
The 5000-year-old "masterpiece" tomb, which would have been a "major challenge" to construct without metal tools or powered machinery, is said to show a "tremendous" commitment.
From the outside, the structure looks like a grassy mound, but to appreciate its size and significance, visitors must explore its depths.
Why this 5000-year-old Neolithic tomb in Scotland is one of Europe's 'finest'
Each wall of the passage is formed mostly of a single, gigantic sandstone slab up to three tonnes in weight.
The Maeshowe Chambered Cairn is a popular place to visit, with users giving it a 4.6/5 out of 766 reviews on Tripadvisor.
One person said: "Maeshowe is an amazing Neolithic site. The tour was great - entertaining and informative. This site is 5000 years old and was built by world-class engineers.
"Our guide gave us insight into the history and provided amusing anecdotes all at the same time! And the gift shop was among the best we went to! Definitely recommend!"
Advising potential visitors, Visit Scotland states that access to the Cairn is guided only, starting and finishing at the Visitor Centre at Stenness.
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The organisation says: "Due to limited capacity, it is strongly recommended to reserve your tour online to guarantee entry and avoid disappointment."
However, it adds that it is well worth the effort, calling Maeshowe the "finest" chambered tomb in Northwest Europe.
From the Viking runes carved onto its walls to other nearby Neolithic sites like Skara Brae, the Ring of Brodgar and the Stones of Stenness, the area has so much to offer.
