Here's a cross section of heath soil on display, which clearly shows the ice age sand deposits.

Fun fact: Rime Isle from the Fafhrd and Gray Mouser stories is partially inspired by the Lüneburg heath. The descriptions are spot on and Leiber wrote "Belsen Express" around the same time and must have been familiar with the region.

I'd be a little concerned about that thing weathering erosion

Coooooool!!

Is the green tint at the bottom of the column new plant/moss growth?