The Story of the Treasure of the Klementinium is basically one of those crazy stories you hear at a bar.
So a guy stumbles into a bar, obviously pretty shaken and pale. After a while the other patrons of the bar get him to talk and he tells this unbelievable story:
He, a stone mason, was hired by a hooded Figure for a Job that did not have much description. He has to wait at a certain time at a certain place in the city of Prague. He was blindfolded, picked up by a carriage, and driven to his location. Because he heard the bells ring, he could figure out that the place he was brought to was probably the Klementinium, a sort of historic complex of buildings in Prague that houses the National Library of the Czech Republic, and also the home of the Jesuit Order, that was about to be dissolved by the king.
The Stone Mason was, still blindfolded, walked around the building in lots of circles and confusing patterns until he was was brought to a corridor, and was told to wall it up. The stone mason did so and, when he was finished, he was blindfolded again and brought back somewhere in the city of Prague. His first stop (obviously) was the next bar, where he told his story.
The next day, The King gave the Order to dissolve the Jesuit order and seize all of their treasures, and scrolls. The King’s man found some valuables but not the masses of Treasure they expected. So combine the two stories and you got yourself a Treasure Legend.
I visited Prague to look for the Treasure but sadly the renoations of the Klementinium over the last centuries probably would have brought up the Treasure at some point.