Silbury Hill

Lunch calls and we skirt around Silbury Hill’s 40-metre-high “pregnant belly” to picnic at the centre of Avebury’s complex.

Hotter drier summers could increase visitor numbers and change the plant species which stabilise the chalk downlands, causing more soil erosion, while Stonehenge, Avebury and Silbury Hill face increased rainfall and flash floods.

They have also long known about the other monuments — burial chambers, a 130-foot-tall mound of chalk known as Silbury Hill and many other circular structures.

Participants will take private tours of meditative sites like Stonehenge’s inner circle, the Glastonbury Tor and Chalice Well, Tolkien Trees, Silbury Hill and Cheddar Gorge.

Many prehistoric mounds like Silbury Hill near Avebury are also circular.