Goethe memorial Willemer-Gartenhaus, Cultural heritage monument in Sachsenhausen, Germany.

The Willemer-Gartenhaus is a classicist garden house on the Mühlberg in Sachsenhausen, built on a small footprint so that it rises like a tower over three storeys. Its plan joins two near-regular octagons: the street-side part holds one museum room per floor and carries a rectangular oriel with a balcony, while the garden side contains a spiral staircase and three windows facing the garden. The upper floors and the hipped roof are clad in natural slate, the ground floor is white plaster over a low base of red Main sandstone, and two slender columns support the oriel.

The Frankfurt banker and author Johann Jakob von Willemer bought a garden house standing in a vineyard on the Mühlberg in 1809 and had it converted into a summer residence. On 18 October 1814 he and his third wife Marianne received Goethe there to watch the bonfires on the Taunus ridge marking the first anniversary of the Battle of Leipzig. Parts of Goethe's West-östlicher Divan, including poems of the Buch Suleika, are thought to have been written here by 1815.

The house embodies the connection between Goethe and Marianne von Willemer, whose poems found their way into his literary works. Visitors can see the rooms where this creative partnership took shape.

The house has no heating and is closed during the winter half-year. The garden and memorial are open on Sundays from 11 a.m. to 4 p.m. from April (or Easter Sunday) until mid-October, with free admission. The entrance door is in a small lean-to annex on the northwest side; the two upper floors are reached by a spiral staircase.

The two ginkgo trees behind the house echo the poem Gingo biloba, which Goethe gave to Marianne von Willemer in 1815 decorated with two ginkgo leaves; a facsimile of that handwritten sheet is shown in the memorial rooms. The original building was destroyed in the 1943 air raids (some sources say March 1944) and rebuilt in identical form between 1962 and 1964.