Jubiläumswarte, Observation tower in Gaaden, Austria.

The Jubiläumswarte is a 20-metre tower of galvanised steel on the 653-metre summit of the Eschenkogel, a peak of the Anninger in the municipality of Gaaden. It has a square plan, slender open construction and internal stair flights leading to the viewing platform. It replaced a 16-metre iron tower of 1898 that was demolished in March 2021.

The Naturfreunde association of Mödling opened a wooden viewing platform, the Sofienwarte, on Eschenkogel on 28 July 1878. In 1896 three members founded a fund to build a new tower for Emperor Franz Joseph I's 50th jubilee; 10,200 crowns were raised and construction began in 1898. The iron tower opened on 3 July 1898. It was renovated for its centenary in 1998, closed in 2019 due to foundation and steel damage, demolished in March 2021, and replaced by the current 20-meter tower, released on 26 June 2021.

The name refers to the 50th anniversary of Emperor Franz Joseph I's reign in 1898, for which three members of the Mödling Naturfreunde raised 10,200 crowns to build the iron tower. Its predecessor, the wooden Sofienwarte of 1878, honoured Sophie von Todesco, a supporter of the association's Anninger fund.

The tower stands on the 653 m Eschenkogel summit in the Gaaden municipality; the new steel tower has internal stairs and has been climbable since 26 June 2021. The old tower was closed from May 2019 and demolished in March 2021, so paths and signage may still refer to the earlier structure. From the top, the north view takes in Mödling, Hinterbrühl and Vienna; the Hochanninger blocks much of the east.

On clear days, visitors from the tower can spot distant mountain peaks like Schneeberg, Rax, and Schöpfl in the distance. This far-reaching view lets you understand the full scope of the surrounding mountain region.