The Holy Grail is one of the most sought after treasures of all time, and one treasure hunter thinks he knows exactly where it is. He invites Scott Wolter along on his quest to find it, and the result is a North American treasure hunt of epic proportions. Legends, a treasure map and the results of ground penetrating technology all point to the Grail being in a single location--a holy well on the property of a rumored Templar Prince. What Scott finds in and around the well will shock even the skeptics in this edge-of-your-seat season finale.

The Newport Tower is considered by many to be the most mysterious structure in the United States. Some people think it's a colonial era windmill or perhaps all that's left of an early water tower, but Scott Wolter is convinced it's something far more significant. Because of the archaeoastonomy and solstice illuminations that take place inside of the meticulously planned stone structure, he believes the Knights Templar came to America and built it centuries ago. Now, he's dead set on proving his theory. While planning an elaborate laser light show designed to illustrate the Tower's miraculous features, Scott discovers something else significant that ties this structure--and the Templar's modern day initiates--to one of America's most visited and most treasured icons.

When Scott Wolter began investigating mysterious artifacts, he started to notice one unique symbol appeared on many of them. The symbol, now known as the "Hooked X", baffled researchers who couldn't make sense of it. As Scott's investigation into the origins of the symbol unfolds, he realizes its use is unique to just two notoriously secret groups--the Knights Templar and their modern day brethren, the Freemasons. Used in secret codes, cryptic ciphers and even the alleged tomb of Jesus himself, the symbol could be the key to understanding two of the biggest mysteries of all time--exactly what the Holy Grail is, and where it's hidden today.

Heading to Tucson, Arizona with his son Grant, Wolter is eager to investigate a mysterious cache of crosses, swords and other relics pulled from the desert in the 1920s. One sword has a date--800 AD--written in Latin, which would suggest a group of Europeans was in the American Southwest hundreds of years before Columbus made it to America. Wolter's investigation is particularly important for one man--the grandson of the man who helped discover the items. The investigation could determine whether the artifacts are part of an elaborate hoax or part of a find that could change history.

After his famous expedition to map the American West with William Clark, Meriwether Lewis recorded details of the adventure in a journal and intended to publish it. Before he could, he was shot and killed in an inn on the Natchez Trace. His death has been classified as a suicide, but as forensic geologist Scott Wolter discovers, there's reason to think he may not have killed himself. As Wolter investigates the death of America's most famous explorer he uncovers details that suggest President Jefferson himself may have had ulterior motives for the Lewis and Clark expedition that have never made it into the history books and may have led to his violent death.

There are 800 very old, very mysterious, man-made stone sites in the Northeastern part of the United States. Forensic geologist Scott Wolter heads to rural Pennsylvania to investigate one of them--a meticulously crafted stone chamber buried underground in the woods. When he realizes it may have been a ritual bath chamber for a secret society, he embarks on a quest for answers as to who built, when and why.

In the late 1500s, years before Jamestown, the English sought to create their first settlement in America at Roanoke. A party of 119 colonists came over and settled but ultimately vanished. The fate of the Lost Colony of Roanoke has eluded archaeologists, historians and North Carolina locals, but as forensic geologist Scott Wolter discovers, a series of 48 stone clues that have been largely ignored and considered frauds may in fact hold the answer to America's oldest cold case.

Geologist Scott Wolter has reason to believe America has its very own Stonehenge in New Hampshire. With the help of a young man who discovered an amazing connection between America's Stonehenge and Stonehenge in England, Wolter explores the possibility that the ancient Phoenicians are connected to both of these megalithic sites. At America's Stonehenge, he uncovers many clues, including a sacrificial table and a mysterious message carved on a stone in ancient script that helps advance this provocative theory. He also discovers both sites are accurate astronomical calendars and that alignments with the heavens are incorporated into their design.

A man shows up at Scott Wolter's lab with a 500-pound discovery. In the flatbed of his truck is a large boulder he pulled from the Arkansas River, inscribed with a mysterious bull symbol. Wolter's investigation into who carved the stone and for what ritualistic purpose ultimately reveals a connection between the ancient Egyptian cult of the Apis bull, the mysterious religion known as Mithraism and a party of pre-Columbian explorers to Oklahoma's panhandle. In the end, carvings in a cave in America's Heartland shed light on an ancient connection that could prove a group of religious outcasts made it to America in pre-Columbian times.

Geologist Scott Wolter visits a Minnesota farmer who wants to investigate the possible existence of bones from a giant he unearthed in his yard. The bones raise the question of whether Vikings could have traveled all the way to America.

Scientific testing connects a prehistoric Bronze Age civilization with the mysterious disappearance of vast amounts of copper from Lake Superior.

Scott Wolter investigates a burial site in the mountains of Arizona, only to discover it may belong to a medieval Englishman.

Geologist and adventurer Scott Wolter explores a government-restricted site, and makes a startling discovery connecting the ancient Mayans with rural Georgia.