Up and up we go, where we meet, nobody knows!
Kids can explore this optical puzzle in Graz’s Burg (“Castle”), now used as the headquarters of the regional government. Set in a round tower, two sets of spiral stairs curve up, around, and sometimes into each other.
Designed by a nameless master builder in the reign of Maximilian I (~ A.D. 1499/1500), the stairs are very rare, but not unique. Another twin staircase can be found in the Church of St. Elisabeth in Košice, Slovakia (A.D. 1477).