This dolmen has a strange doorway
and a mysterious port-hole on its capstone
This quoit, locally known as The Giant's House, is one of England's most impressive dolmens. The capstone
is 3.7m (12ft) long and, in its half-fallen state, 4.6m (15ft) high. There's also a natural hole
piercing its highest point.
The function of this port-hole is still a mystery: experts speculate that it was used for astronomical
The rectangular chamber is 2 x 1.5m (6ft 6in x 5ft) and is made of six uprights (originally seven), averaging
about 3m (10 ft). A strange doorway cut out of the entrance stone may have been for
the passage of bodies. Curiously, the sloping angle of the top of this hole is reminiscent of many
free-standing stones, as the Stones of Stenness,
in the Orkney Isles (Scotland).
Trethevy is surrounded by the remains of a mound, which -probably- only covered
the lower part of the stones and acted as a ramp to aid access to the chamber.