To ace this mystery spot puzzle you need only identify which national park is indicated by the clues listed below.*  Here's a hint: it's not one of the 58 National Park-designated units of the National Park System.

If you load cargo, weigh anchor, sail out of the harbor, and turn left, what have you done?

Any of the ones stacked on my coffee table can be clipped, but not loaded.

A visit to the Windy City should include a stop at the Navy Pier.

Bonus clue, no extra charge: "The shot heard round the world" was not the only big bang that occurred at Concord.

 Readers answering correctly will be eligible for our monthly prize drawing.

We'll reveal the answer and explain the clues in tomorrow's Traveler.

* No cheating! If we catch you Googling or engaged in other sneakery of any description, we'll make you write on the whiteboard 100 times: "Per Rule 2, Section 2 of the Official Playing Rules and Casebook of the National Football League: Each team will make 12 primary balls available for testing by the Referee two hours and 15 minutes prior to the starting time of the game to meet League requirements. The home team will also make 12 backup balls available for testing in all stadiums. In addition, the visitors, at their discretion, may bring 12 backup balls to be tested by the Referee for games held in outdoor stadiums. For games in outdoor stadiums, eight new footballs, sealed in a special box and shipped by the manufacturer to the Referee, will be opened in the officials’ locker room two hours and 15 minutes prior to the starting time of the game. These balls are to be specially marked by the Referee and used exclusively for the kicking game. For games in indoor stadiums, six new footballs will be shipped."