Hagia Sophia

In the northwestern part of the building, there is a column with a hole in the middle, covered with bronze plates.

An excerpt from the article 18 facts about Hagia Sophia

The column is called the "column of weeping," the "column of wishing," or the "column of sweat." Legend has it that the column became damp since Gregory Thaumaturgus, a bishop and confessor, appeared near it in 1200.

Touching the dampness is said to cure many diseases.