If you follow the Schneebergweg, you pass the Westwall. On the side in the grass is a stone with information about the wall.
Opposite the stone is a short side path leading to the chapel.
Here is the description of this chapel (Wikipedia):
Schneeberg Chapel
A tourist attraction of a special kind is the after the end of World War II on the lower southwest slope of the Schneeberg in front of the Westwall between Schneebergweg and Senserbachweg built Schneeberg Chapel. The local farmer Maahsen (1900-1977), who had been forced to build the wall, had vowed that if he and his family, as well as the villages of Vale and Valezier would survive the war, he would build a chapel there let wool. After the Schneeberg had been captured from the east in October 1944, Vaals and Aachen had been liberated, and Bauer Maahsen and his family had survived the fighting unscathed, a few months later he began planning and constructing the chapel. After he had received the necessary money through donations and also received a building permit, the foundations were poured with building rubble from Aachen and built on the planned octagonal chapel. On top of the roof, Maahsen had a star-shaped concrete wreath cast in concrete, on which a cross of bluestone was fastened. In this wreath, a bell from the disbanded Redemptorist monastery from Vaals was built, which he had bought for 75 DM and which is now firmly mounted.
The window wreath below the dome and the front door were designed by the Aachen artist Peter Hodiamont. The inside of the chapel is determined by a 16-hundred-pound boulder, on which rests the altar plate, and by a cement-gray Madonna from Bruges by the Belgian sculptor Dupont. After quite a long period of construction, the chapel was inaugurated on September 8, 1963 solemnly