That’s what happened one day in September 1887, when Mark Twain took the train from his Connecticut home to New York to meet Robert Louis Stevenson, the popular writer of Treasure Island.
“The Scottish-born Stevenson was staying near the square at a hotel on Tenth Street and University Place,” writes Emily Kies Folpe in It Happened in Washington Square. Stevenson, suffering from tuberculosis, was passing through the city on his way to an upstate sanatorium.

“The two famous writers strolled down to the park and, following Stevenson’s doctor’s orders to take in the sun every day, settled down on a sunny bench to enjoy a good talk.”
So what did they discuss? According to the website of the Hotel Albert, where Stevenson likely stayed on 10th Street:
“The two men settled comfortably into a sunny part of the northwest corner of the park and spent the next five hours telling stories to one another, ‘regardless of wives, lunch and doctors, from 10 a.m… until 3 in the afternoon.’”
The cache is not at the above coordinates.
To help you along, answer the following questions to reveal a park bench where you may rest and have your own chat with someone.
S41 0a.bcd E174 rs.tuv
Number of letters in middle name (B____) = a
'Travels with a Donkey in the Cevennes' was published 1bcd
Born in 183r
Married in 187s
World lecture tour started in 189t
'The Adventures of Tom Sawyer' was published 187u
Died in 191v
Muggles may approach from a number of directions, please take care in hunting out the cache and also it would be appreciated if you would rehide carefully. You will need your own pen/pencil.