It may not be quite a journey to the centre of the earth but a select group is to be taken to the heart of Europe's biggest man-made monument, Silbury Hill.
The enigmatic mound towers 40 metres above the adjacent countryside.
However, thanks to numerous excavations over the centuries, the 5,000-year-old hill has been left full of cavities.
Some archaeologists have even likened it to a big Gruyere cheese but on a serious note have said it is in danger of collapse.
English Heritage, working with civil engineers Skanska, are about to start repairs on a tunnel dug in 1968 by a university team led by Prof Richard Atkinson and filmed by the BBC.
The 40-year-old tunnel, which was only partly filled, leaving cavities, will be re-opened and eventually backfilled with chalk rubble.
In July English Heritage will be inviting archaeologists into the re-exposed tunnel to travel to the centre of the mound, possibly the last time it will be seen for another 5,000 years.
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