With countless Americans looking for ways to save money, many are trading in their typical summer trips abroad for domestic adventures—opting instead to re-discover the good old U.S.A.

To help inspire these summer adventures, we’re giving away 50 of our popular U.S. guidebooks in 50 days, and featuring all U.S. destinations on Moon.com for the next two weeks, along with guest blogs from several of our authors talking about their top cities.

To win a book, you only need to answer one simple question—“What’s your favorite U.S. city?”

Whether it’s the southern charm of Memphis, the natural backdrops of Seattle, or the neon lights of Las Vegas, tell us in 100 words or less what your top city is and you’ll get a chance to win a free guidebook of your choice. One winner will be chosen daily for the next 50 days—so there are plenty of chances to win!

All submissions must be emailed to giveaway@moon.com between July 20th and September 7th. Winners will be selected by Moon staff and will be judged according to the quality and creativity of the response—one word submissions will not be accepted. Please include your full name and an email address with your entry. Excerpts from winning entries will be posted in a weekly round-up on the Moon Water Cooler, so check back often to see if you’re a winner.

Good luck—and happy domestic travels!