TV Guide American Heroes Channel Thursday

Experts discuss how Hitler was able to keep a city hidden from the Allies during World War II that wasn't discovered until the Nazis were pushed out of Poland.

Experts investigate new discoveries on a strange fortified island that reveal the terrifying truth behind Hitler's secret plan to win World War II at all costs.

Experts explore a strange, abandoned mansion on a remote island that's central to countless conspiracy theories involving Nazi missions.

Experts discover that an abandoned eerie structure in France could have doomed the Allies in World War II, and new discoveries reveal the truth.

American forces are discussed in relation to the invention of new wartime tactics, which resulted from attacks that turned the tide of WWII in the Pacific.

Grandiose parades, soaring speeches and passionate radio announcements from the Second World War are uncovered by military historians.

The Mutual UFO Network uses science, psychology and law enforcement to carefully investigate people's personal accounts of UFO sightings and alien abductions.

While investigating a series of mass sightings in three Mexican cities, the members of a UFO investigation team encounter conflicting stories and evidence.

In a Philadelphia suburb where reports of UFO sightings have recently increased, MUFON investigators search for sightings that can possibly be verified.

An exploration of how people prepare for the end of times, from the imperfect history of bible prophecy to the current approach of groups such as ISIS.

Nuclear war preparedness enthusiasts exhibit their survival bunkers and stockpiled supplies, determined to survive in the face of global annihilation.

A survival-minded group of individuals explains their plans to avoid becoming casualties of a global pandemic that could affect a vulnerable human race.

A huge, secret planet, which has caused mass extinctions in the past, has a gravitational pull so strong it could cause Earth to turn upside down.

The prophecies that foresaw some of the most tumultuous events in history are studied, as well as some that have yet come to pass.

With the discovery of numerous earth-like planets in our universe, astronomers theorize we should be prepared for hostile, extraterrestrial life forms.

The Vatican is one of the most secretive institutions on earth, protecting not only its elite reputation, but it's faithful members, with reckless abandon.

The question is posed of whether expert American code breakers have the knowledge to defeat the uncrackable encryption on consumer cell phones.

A study of how spies determined crucial moments of the Civil War, from a group that met to plot an assassination, to the work of Alan Pinkerton.

An in-depth exploration is taken into Freemasonry, an organization in which most of the Founding Fathers and many presidents were members.

Brothels, one of society's most clandestine institutions, are examined, featuring a look into the secrets they have held and why they have endured.

An exploration is presented into the stories behind America's secret bunkers and how they have played an important role in history.

Alcatraz is explored, featuring a conspiracy that helped three inmates escape, the truth behind the dungeon and a look at the remnants of a military outpost.

An inside exploration is presented into the truth of the supposed UFO cover up and if there is actually a secret government that guards the truth.

An inside exploration is presented into the world of supposed outlaw bikers, featuring an in-depth look into their tightly-guarded clubs.

An exploration is presented into the stories behind America's secret bunkers and how they have played an important role in history.

Alcatraz is explored, featuring a conspiracy that helped three inmates escape, the truth behind the dungeon and a look at the remnants of a military outpost.

An inside exploration is presented into the truth of the supposed UFO cover up and if there is actually a secret government that guards the truth.

An inside exploration is presented into the world of supposed outlaw bikers, featuring an in-depth look into their tightly-guarded clubs.

An in-depth exploration is taken into Freemasonry, an organization in which most of the Founding Fathers and many presidents were members.

Brothels, one of society's most clandestine institutions, are examined, featuring a look into the secrets they have held and why they have endured.