2020 marks the 25th anniversary of this devastating attack: On April 19, 1995, a U.S. Army veteran named Timothy McVeigh detonated a truck bomb outside the Alfred P. Murrah Federal Building in Oklahoma City, killing 168 people and injuring hundreds more.

Fifty years after Jimmy Hoffa's disappearance, no one knows how he died or where he was buried.

From the 1950s to 1970s, Teamsters President Jimmy Hoffa was America's working class hero.

Some theories about the Spear of Destiny are as old as the lance itself.

The lance that pierced Jesus on the cross is said to hold mystical powers.

When the U.S.S. Eldridge disappeared in a green fog, theories surrounding the failed Naval project ran rampant.

In October 1943, the U.S.S. Eldridge became enveloped in a green fog and disappeared in the Philadelphia Shipyard.

To this day, no one is quite certain of how composer Wolfgang Amadeus Mozart died.

On December 5th, 1791, one of the greatest composers of all time died at the age of 35.

After the Titanic sank, people searched for something—or someone—to blame.

When the Titanic sank on its maiden voyage in 1912, over 1,500 people lost their lives… and to this day, many wonder if poor planning, negligent design, and undertrained crew members played a role in the devastating event.

His untimely death in 1996 left fans searching for answers.

In 1996, rap artist Tupac Shakur was shot and killed just off the Las Vegas Strip.

He was killed by police outside Chicago's Biograph Theater on July 22nd, 1934.

By the 1930s, John Dillinger pulled off 24 bank heists and three jailbreaks—making him Public Enemy Number One.

Since its establishment in 1913, the Federal Reserve has been primed for conspiracies.

In 1910, six wealthy bankers met in secret on Jekyll Island, Georgia.

In 2010, word spread online that things around the world were changing. From beloved children's books to the titles of movies, people were finding out that what they had once remembered as fact was now false.

The Matrix is considered to be one of the greatest science fiction films of all time. But what if its central idea was based more in fact than fiction?

When a major earthquake hit the Caribbean in 2010, conspiracy theorists started studying the skies—noting peculiar low-frequency wavelengths.

After his sudden death in 1943, Nikola Tesla never saw his plans for an earth-shaking death ray to fruition.

After General Butler's claims were heard by the Special Committee on Un-American Activities in 1934, he was called a liar and a fraud.

In the 1930s, many felt that Franklin Delano Roosevelt’'s New Deal program erred too far on the side of socialism.

Demonic possession, alien technology, and a secret base in Antarctica—it all seems like the stuff of science fiction. But for many, it's the explanation for how Adolf Hitler rose to power...and how he might have survived World War II.

Many have wondered how someone as evil as Adolf Hitler came to power. Between his rise from anonymous artist to fanatical dictator, his obsession with so-called miracle weapons, and his final days in an underground bunker, some feel as though there is more to Hitler's story.