Dévényi Antal-kilátó, Wooden observation tower in Piliscsaba, Hungary.

The Dévényi Antal lookout was an 11.5-metre wooden tower on the 447-metre Nagy-Kopasz summit in the Pilis, built to Lőke Ferenc's design from stacked pine beams recalling the game Jenga. Its roughly 17-square-metre viewing level, a 4.2 x 4.2-metre prism of 132 cubic metres of timber, was dismantled in October 2025 after the structure tilted.

The tower was named after Antal Dévényi, a forestry engineer who served as chief forester of Archduke József's Pilis forest estate. He played a leading role in reforesting the largely treeless hills around Piliscsaba during the 19th century. The structure itself was inaugurated on 12 June 2015, and its timber was dismantled in October 2025 after the leaning frame was judged beyond repair.

The tower's form was inspired by the wooden stacking game Jenga, as conceived by architect Lőke Ferenc. Its structure is a 4.2 by 4.2 metre prism made of 132 cubic metres of solid pine beams stacked on one another. The name Dévényi Antal honours the forest engineer who led the reforestation of the treeless Piliscsaba hills in the 19th century.

The tower was demolished in October 2025 after its timber structure tilted and was found beyond repair, so it can no longer be climbed. The forest rest area beside it, with benches, an information board and a fire pit, remains the destination on the 447-metre Nagy-Kopasz summit. Marked trails reach the site from the Klotildliget stop on the Budapest–Esztergom railway line, and also from Pilisvörösvár, Pilisszántó and Piliscsév.

The tower was demolished in October 2025 after its pine beams warped and the structure tilted; it had stood only since 12 June 2015. Its name honours Antal Dévényi, chief forester of Archduke Joseph's Pilis estate, who led the reforestation of the bare Piliscsaba hills in the 19th century.