St. Martin's Chapel is a former late Gothic charnel house to the south of Perchtoldsdorf church. The chapel, named in 1455, was rebuilt in 1512 by Master Georg from Vienna and is connected to the castle by a walkway. Until the 16th century, the remains of local residents buried in the small burial ground next to the church were kept here. The memorial to the victims of the two world wars has been housed here since 1953.