Examines the various conspiracy theories espoused on the Internet, in articles and in public forums that attempt to explain the 9/11 attacks. It includes theories that the World Trade Center was brought down by a controlled demolition.

April 14, 1865--Actor John Wilkes Booth shot President Lincoln in the back of the head at a Washington theater. Days later, Wilkes died in a standoff, and eventually, eight Southern sympathizers were tried for conspiracy. This much we know to be true. But many conspiracy theories arose--pointing to the Confederacy, the Union, and even the Catholic Church! Once again, new theories have sprung up, based on recently found documents and forensic technology. Historian Edward Steers Jr. connects Booth to the Confederate Secret Service in Montreal, which indirectly links him to Jefferson Davis and the Confederate government; while biographer Charles Higham places Booth in a larger conspiracy. Historians, biographers, and researchers, who take issue with Steers and Higham, counter their arguments here.

An investigative special chronicling former CIA operative Barry Eisler, journalist Steve Volk, and filmmaker Chris Garetano's exploration into the conspiracies and accusations that surround an abandoned military base known as Camp Hero.

The Maya of Central America were the greatest pyramid builders of the ancient world. The Egyptians built less than a 100 pyramids--the Maya built thousands.

In the American Southwest, there is no more puzzling mystery than the magnificent stone cliff dwellings of Mesa Verde. Why did the Anasazi Indians suddenly move their villages to these perilous cliffs in the 13th century--and then abandon them.

For nearly a century archaeologists place the height of the Maya civilization during the First Millennium AD.