In cities across the planet, an invisible world stretches beneath your feet. What's down there, exactly? Plague victims, secret crypts, party spaces, squatters, and...? Join Ben and Matt as they tackle one of the most important parts of the catacomb story: Figuring out how to get in.

Was the United States always a Christian nation? Was Abraham Lincoln a principled abolitionist? It seems that every year new evidence redefines our earlier assumptions about the past. Tune in to learn more with Ben and Matt.

It sounds like the plot of a James Bond film: Some shadowy super villain holds the world for ransom while threatening to destroy civilization with an earthquake, floods or volcanic eruptions. But what if it was true? Could someone really create a natural disaster -- and use it as a weapon?

From stories of suppressed Tesla technology to worries over weaponized hurricanes, HAARP is a mainstay in many conspiracy theories. But what is it actually doing? Listen in and learn more.

Earthquakes are terrifying reminders that some of Earth's processes remain beyond human control. So why do some people think scientists can actually create these disasters? Learn more about earthquake conspiracy theories in this episode.

For decades rumors about Bohemian Grove have run wild through the conspiracy world -- but what actually happens at Bohemian Grove? Tune in to learn more.

In 1977, astronomer Jerry Ehman may have stumbled across the most significant discovery in human history - or, at least, found one of the strangest observable things any human being has ever witnessed. Listen in to learn more about the WOW! signal.

Could we really discover intelligent life out there in the inky black of space? How? Listen in to learn more about SETI.

Cereologists don't all agree on how crop circles form, but there are some wild theories out there, including freak weather and UFOs. Also, hoaxers confessed to making hundreds of circles. Tune in to learn more about the theories surrounding crop circles.

Journalist Danny Casolaro swore to his friends that he'd stumbled upon something big -- a massive conspiracy at the heart of the US government, spanning the globe. His life, he believed, was in danger. But what happened next -- and what, exactly, is "The Octopus"?