Himmelberg Tower, Observation tower in Alfeld, Germany

The Himmelberg Tower is a reinforced-concrete observation tower on the 307-metre Himmelberg in the Sieben Berge hills, north-northeast of Alfeld in Lower Saxony. Built in 1985, it stands about 22 metres tall and has 119 steps leading to its viewing platform.

The Himmelberg had been a popular excursion destination since the mid-19th century, with summer refreshments on the summit around 1896. Around 1900 the Alfeld beautification society built a wooden viewing platform in an oak's fork; in 1930 a 17-metre iron tower replaced it, funded by the town and district of Alfeld at 4,000 Reichsmark. After damage forced closure in 1984, the present 22-metre reinforced-concrete tower with 119 steps was completed in 1985 and renovated in 2005.

The Himmelberg has drawn Alfeld families, clubs and school classes since the mid-19th century, and by around 1896 a summer refreshment stand stood on the summit. Around 1900 the Alfeld beautification society built a wooden viewing platform in the fork of an oak tree. Today the tower is a destination for outings from the town below.

Reaching the platform requires climbing internal stairs with roughly 119 steps, which are accessible under normal conditions. Comfortable footwear is recommended, especially for those making the full ascent, and visitors should exercise care during wet weather.

The tower stands on the 307-metre Himmelberg hill in the Sieben Berge range, on the territory of Alfeld's Langenholzen district, north-northeast of Alfeld. Its 119 steps lead up a reinforced-concrete structure finished in 1985, replacing a 1930 iron tower that had been closed in 1984 after serious damage.