Seahenge discovered when the forces of the sea and the tides eliminated the sand from the beach of Holme in Norfolk, revealing remains of an ancient structure.

This text is from the Norfolk museum collection website
In the summer of 1998, the changing sands of the beach of Holme on the northern coast of Norfolk revealed something extraordinary. In the sand they were preserved in the sand of a unique wood circle that dates from more than 4000 years, until the age of early bronze. Althegh discovered on a modern beach, the circle was originally built in a navy, somehow from the sea. The woods were organized in a circle of 6.6m (21 feet) in diameter, which includes 55 tight oak posts, each originally up to 3 m (10 feet) high. The site became known as ‘Seahenge’. “
The woods were removed from the beach, preserved and then put on a permanent exhibition at the King’s Lynn Museum.
Source and other images here.
A ‘Open Country’ program of BBC Radio 4 on Seahenge is available here.
The program describes the discovery, the challenges of archeology that had to be made between a high tide and the next, the age of the structure, its probable origins and move to the museum.