Hindlerberg, mountain summit in Lower Austria, Austria

Hindlerberg, called Königswarte in German, is at 344 m the easternmost mountain in Austria, in the lower Carpathians between Wolfsthal, Berg and Edelstal. A 22.7 m lookout tower, reopened in 2001, stands near the summit on the Wolfsthal-Berg municipal boundary. Just below the summit to the northeast lie the ruins of Pottenburg castle, and a red deer enclosure occupies the forest on the north side.

The summit's military use began in 1958, when Austria built a signals-intelligence facility here with United States assistance. Operated by the Austrian Army's intelligence service, the Fernmeldeaufklärungsanlage Königswarte has been modernised repeatedly and is still used for SIGINT. The 22.7-metre lookout tower near the summit, at the Wolfsthal–Berg municipal boundary, was reopened in 2001.

The name Königswarte, "King's lookout", is used for the summit and its 22.7 m viewing tower, reopened in 2001 on the boundary between Wolfsthal and Berg. The tower is the goal of walks on the Ostösterreichischer Grenzlandweg, and the wooded north slope holds a fallow deer enclosure.

The various hiking trails are consistently marked and offer different difficulty levels to suit walkers of all experience. Signposts display estimated walking times and difficulty grades so visitors can choose the route that fits them.

The 22.7-metre lookout tower near the summit, reopened in 2001, stands exactly on the boundary between Wolfsthal and Berg. Just below the top to the northeast lie the ruins of Pottenburg castle, and a game enclosure for fallow deer occupies the northern woods.