Papenkasteel, Renaissance castle in Uccle, Belgium.

Papenkasteel is a brick castle built between 1685 and 1688 for jurist Philippe-Vincent Franckheim. Its square brick tower, banded with lighter stone, has a dark bell-shaped slate roof with a small round clock in a pale stone surround; two tall mullioned windows sit below. A lookout turret on the main building overlooks the gardens and pond.

The castle was built between 1685 and 1688 by Brussels lawyer Philippe-Vincent Franckheim as a noble residence of that era. It represents the wealth and architectural ambition of prosperous citizens during the late 17th century in the region.

In the early 20th century, an artists' community made this castle their home, including violist Germain Prévost and French painter Abel Gerbaud. The building became a meeting place for creative people who worked and lived within its walls.

The castle is private property and cannot be visited inside; the brick tower, slate roof and clock face are seen from the street. The grounds adjoin the Kriekenput and Kinsendael nature reserves, and the Geleytsbeek again flows in its old bed past the pond since 2018. Nine trees on the estate are listed, the largest a plane over 5 metres around.

A pond on the grounds once served as the final retention basin for water from mills that operated along the Geleytsbeek stream. This water system was key to the area's historical economy and industrial activity.