Adrienne von Speyr, who died in September 17, 1967, was buried three days later on her sixty-fifth birthday in Basel, Switzerland next to her husband, Werner Kaegi. Here's a map of the Basel cemetery Friedhof am Hörnli, which is also the same cemetery where Karl Barth was buried.
View Friedhof am Hönli in a larger map
Here is the location of her tombstone in the cemetery.
View Tombstone of Adrienne von Speyr in a larger map
When you visit, you will see her unique tombstone, which symbolically represents the circumincession of the Trinity. It was carved by Albert Schilling, who also carved the altar in the Basel Allerheiligen church.
"I believe as best I can; I hope as best I can; I love, finally, as best I can. But the Son's love--and in it the love of the triune God--is infinite, accompanying the dying through death and leading them to their place in eternal life" (Adrienne von Speyr, The Mystery of Death, 114).