The Vortex Garden with a villa on Mathildenhöhe is Darmstadt's only public park in private ownership.

Designed according to the principles of permaculture and the balance of natural eco-systems, the owner would like to make the garden accessible as a "place of vitality, renewal and recreation". On request, the design and the idea of the garden are explained to interested visitors.

From 9 am to 9 pm the garden is open for visitors free of charge.

The "Haus Martinus" (formerly "Haus Hubertus") was designed in 1921 by the architect Jan Hubert Pinand.