The word square displayed below has a remarkable property. On the surface it is an ordinary double word square, with a different word in each row and column. In addition, starting in the upper left corner and following the knight's tour indicated by the lines reveals another five 5-letter words.
"Word Squares With Wordy Knight's Tours,"
Word Ways: Vol. 49
, Article 22.
Available at: http://digitalcommons.butler.edu/wordways/vol49/iss2/22