Ancient Trees in Cologne
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The Fourteen-Trunked Caucasian Wingnut
Caucasian Wingnut (Pterocarya fraxinifolia). . Free, no ticket. The garden (Flora / Botanischer Garten) is open daily 8am until dusk, at most until 9pm.

The Great Plane of Hohenlind Park
London Plane (Platanus x acerifolia). . Free, open to the public during daytime hours. This is the hospital's surrounding park, not the hospital building itself; the grounds are open, the building is not part of the visit.

The Hohenlind Oak
Pedunculate Oak (Quercus robur). . Free, open to the public during daytime hours. Part of the same estate park as kol_002, roughly 100 m away on foot.

The Turkey Oak of the Volksgarten
Turkey Oak (Quercus cerris). . Free, public park, no ticket. One of Cologne's main city parks.

The Moltke Lime of the Kahnweiher
Moltke Lime (Tilia x moltkei). . Free, public city forest/park (Koelner Stadtwald), no ticket, open at all times as public green space.