Nearly two decades after the Waco Siege, people are still wondering what transpired at the Branch Davidian compound.

On February 28th, 1993, government agents raided a compound in Waco, Texas, belonging to a religious group known as the Branch Davidians. A 51-day standoff ensued, ending in a violent siege.

Valiant Thor's story has sparked a flurry of theories regarding our government's knowledge of UFOs.

In 1957, the Pentagon received an unexpected visitor. His name was Valiant Thor, and allegedly, he was from Venus. His mission on Earth was to convince world leaders to deactivate their nuclear arsenals.

For centuries, people have debated whether or not Jesus Christ rose from the dead. From graverobbers, to Jewish High Priests, to Jesus's own disciples — a flurry of potential thieves has been placed at the scene of his empty tomb.

In Turin, Italy there’s a piece of cloth that has perplexed religious experts for decades. Is the Shroud of Turin one of the greatest antiquities known to us? Or nothing more than a medieval hoax?

Locals are sure that big corporations are after their coal, and started the Centralia Fire to smoke them out. Others insist the blaze was nothing more than bureaucratic incompetence.

For nearly 60 years, a fire has been raging beneath a small town in Pennsylvania. Centralia was once an epicenter of coal mining. But after the blaze sparked in 1962, toxic fumes and sinkholes forced residents to evacuate.

In the final episode of our 9/11 series, we examine the legacy of that day, and how its memory impacted — and still impacts — the world.

How much did the U.S. government actually know about the 9/11 attacks before they happened?

Throughout the 1990s, a private equity firm called the Carlyle Group began purchasing and investing in a multitude of private defense contracting and weapons companies.

We trace the path through history to 9/11, then examine how the official 9/11 Commission Report gave conspiracy theorists a foothold.

The horrific attacks of September 11th come to an end. In the aftermath, rescuers and volunteers clean up while military and government leaders decide how to respond.

The morning of September 11, 2001 changed the world. Twenty years later, questions still linger about the worst terrorist attack in U.S. history.

When U.S. forces invaded Iraq in 2003, investors began buying up Iraqi currency. Some expected a massive payup, others were scammed by unethical dealers. And some believe that terrorist cells or an international alliance of government agencies may be manipulating the dinar's value to reshape the global economy.

In the case of the century, O.J. Simpson was found not guilty of double homicide in 1995, despite a wealth of DNA evidence.

On June 12th, 1994, Nicole Brown Simpson and Ron Goldman were brutally stabbed to death.

In 1976, Prime Minister Harold Wilson made a daring confession — someone had tried to overthrow him and his cabinet.

In 1976, following an abrupt resignation, British Prime Minister Harold Wilson claimed he was forced out of Parliament. As a socialist, he’d provoked liberals and conservatives alike — but with a conspiracy afoot, everyone became suspect in the alleged coup.

Where there's a group of powerful world leaders, there's whispers of conspiracy and a New World Order.

Formed after WWII as a way to unite the divided nations, the Bilderberg Group consists of some of the world's most elite politicians, businessmen, and royalty.

At the 2014 Sochi Winter Olympics, Dr. Grigory Rodchenkov was accused of doctoring thousands of urine samples for Russian athletes.

When the 1984 Summer Olympics generated a massive profit for Los Angeles, cities around the world competed to host the next games.

In the 1st century B.C.E., competition between Roman senators was stiff — even deadly.

In the 15th century, the Medicis were the most powerful banking family in Italy. Members of a rival banking family known as the Pazzi attempted to overthrow them but failed.