This is not really a botanical garden, but I do find it interesting.
I had not thought at it as such, but it turned out to be an almost pilgrims experience, to walk through it. I've seen the places where Jesus and Buddha is said to have been borne, but this one really touched me: The birthplace of evolution! Down house is where Charles Darwin lived all his adult life, and where he wrote On the Origin of the Species. I visited in 2016.

His office where he wrote all his books

The orchard

The walled garden

The beds and glasshouse

The carnivorous plant

The orchids

Part of the glasshouse

Part of the large garden

Another walled part of the garden

A small formal garden

The worm stone - sinking into the ground