Denecourt tower, Observation tower in Fontainebleau, France.

The Denecourt tower is a 5-metre-high dry-stone structure on the eastern summit of the Cassepot chain. A stepped stone staircase with rough side walls climbs the slope to a square tower of grey weathered blocks, whose top has three small stone chimneys or pinnacles. On the north-west wall, a medallion shows the profile of Claude-François Denecourt above a commemorative plaque recalling the tower's reconstruction.

Claude-Francois Denecourt built this structure in 1851 as part of his vision for developing the forest. A collapse in January 1878 led to its reconstruction using public funding the following year.

The tower connects to the blue trails that Denecourt created throughout the forest, which were the world's first marked hiking routes. Visitors who climb it can see the landscape these paths cross.

The tower stands at 136 m on the Cassepot ridge, reached by the helicoidal route de la tour Denecourt; the Fontainebleau-Avon station lies over 2 km away. From the first terrace, 31 steps in three flights (19-8-4) lead up; 16 more (14-2) reach the square top. Two orientation tables sit on the upper terrace walls.

Orientation tables installed in 1985 by the National Forest Office help visitors identify landmarks across a wide panoramic view. These aids make the visit more informative and help with bearings from the top of the structure.