1 - National Treasures

From a bat swung by one of baseball's boldest pioneers, to an iconic painting hidden behind a false wall, these astonishing finds prove that America's greatest treasures can turn up in the most unlikely places.

2 - Blasts From the Past

From WWII bombs pulled from the sea and Nazi bunkers buried in sand, to chemical weapons hidden beneath Washington, D.C., these explosive discoveries prove that history's blasts from the past can still shake our world today.

3 - Shady Secrets

Some secrets refuse to stay buried. Whether it's illicit cargo in a frozen lake, a stolen masterpiece worth millions, or a brothel hidden in the shadow of the Capitol—the truth always resurfaces.

4 - Hidden Giants

From a legendary city swallowed by the jungle, to an underground metropolis stretching 18 levels deep, and even a forgotten pyramid from a lost civilization, sometimes the biggest mysteries on Earth are closer than we think.

5 - Famous Finds

6 - Monstrous Marvels

7 - Secrets From the Skies