Schönberg Tower, Observation tower in Pfullingen, Germany

Schönberg Tower is a 28-metre reinforced-concrete lookout on the 793-metre Schönberg plateau, 2 km south of Pfullingen. Two octagonal shafts, each with its own staircase, are joined at the top by an 8.5-metre-wide gallery and at the base by the entrance. The roofs, copper-clad since 1949, have turned green with patina.

The Schwäbischer Albverein commissioned the tower; first proposals date to 1893, and Theodor Fischer's design was approved on 28 June 1905. Stuttgart firm Luipold & Schneider built it from August to November 1905, and it was inaugurated on 25 March 1906. The 17,000 Marks cost was mainly covered by Pfullingen patron Louis Laiblin. In November 1949 the wooden shingle roofs were replaced with copper, now patinated green.

Locals call the tower "Pfullinger Unterhose" (Pfullingen underpants) or "Onderhos" in dialect, after its shape and colour. In 2006, for its centenary, it was wrapped in a giant pair of underpants from 2 to 29 July and lit at night; the fabric later became 340 shoulder bags.

The structure is open daily for visitors to climb and enjoy the views from the platform. A small kiosk at the site operates on weekends and holidays when you might want to grab refreshment.

In 2006, for the tower's 100th birthday, it was wrapped from 2 to 29 July in an oversized pair of underpants and lit at night. The fabric was later sewn into 340 shoulder bags sold to the public. A larger pair recorded in Bolton in 2005 kept it out of the Guinness records.