Just like the Day Six and Day Twelve challenges, you have puzzle to put together. It may be easier to find the four corner pieces and place them first, then place the edge pieces, and finally the center pieces. Just some jigsaw puzzle solving hints. You are then asked to name the city pictured and to find items hidden around the city.
"Leonardo's reverse handwriting manuscript on perpetual motion wheels can be found in this city. What is its name? (For another clue, Hyde in the north.)"
Answer: London
"Well done! There are four Blades hidden around the city. Please find them and click on them."
Just a reminder that Blades look like pyramids. You can find the location of the Blades on the picture below.

"You have found all four Blades, and lo! they draw an X over a place just slightly north of the Victoria and Albert Museum, home of Leonardo's Codex Forster. What is its name?"
Answer: Imperial College
There are many things just slightly north of the Victoria and Albert Museum as you can see from the map below. But the answer they want is Imperial College.

