Dating back to the 17th century, Warsaw's tunnels known as the "Masonic graves" have sparked archaeological curiosity in recent years — and new research could reveal a connection to the Freemasons and their rumored catacombs.

Based on the mineral composition of the Altar Stone, researchers believe it may have come from Scotland and was thus transported more than 450 miles around 5,000 years ago.

The discovery marks the first time a Columbian mammoth tusk has ever been found in the state.

A trove of letters, photographs, and investigation notes that belonged to Inspector Joseph Henry Helson have now been released, shedding new light on the infamous Jack the Ripper murders that shook London to its core in 1888.

The bottle appears to contain a business card and a handwritten note from 1876. If that date is accurate, it would make this discovery 10 years older than the current world record holder for oldest message in a bottle.

A serial killer in 1950s Wisconsin, Ed Gein killed and skinned his victims, making him the real-life inspiration for Leatherface and The Texas Chain Saw Massacre.

From Carlo Gambino to John Gotti, the Gambino crime family has made headlines in New York City for decades — and it still does to this day.

Authorities in Oklahoma have named BTK Killer Dennis Rader as the prime suspect in a 1976 disappearance — and investigators have been receiving help from his daughter, Kerri Rawson.

Real-life FBI agent Joe Pistone spent five years undercover posing as a jewel thief named Donnie Brasco, befriending mobsters like "Lefty" Ruggiero to gather intel on the Bonanno crime family.

This is just the fifth woolly rhino ever discovered with its soft tissues still preserved.

The Killer Clown's former lawyer Karen Conti claims that John Wayne Gacy's victim count is much higher than the authorities realized and that he may have murdered at least 20 more people than the 33 he was convicted of in 1980.