Secrets Underground: North America's Buried Past by Elizabeth MacLeod.
I was intrigued by this book when I saw it because I've been a fan of the TV show Cities of the Underworld on the History Channel. If you are a fan of that series, you will definitely want to pick of this book.
The first chapter interested me the most as it was on a topic that I teach, the Aztecs. It explains the history of the Aztecs from how they chose the city of Tenochtitlan as their capital to their defeat by the Spanish. It then explains how the city got buried and how it was uncovered. It concludes with what is happening now with the discovery.
The rest of the book is similar covering ships buried in San Francisco during the Gold Rush, a forgotten cave used during the Civil War in West Virginia, underground tunnels used during the Prohibition in Canada, Grand Central Terminal's underground tunnels in New York City, and the bunker under the Greenbrier hotel in West Virginia.
There are also facts that can be found in the margins of the books that give information about other places with similar "hidden treasures."
This is definitely a book to have if you teach any aspect of US History. As a lover of history, I was throughly intrigued with every aspect of the book. As a teacher, I really think that my students will love learning these unusual facts about our country.