By far Gustave Eiffel’s most well-known work, the Eiffel Tower was designed for the 1889 World’s Fair to celebrate the 100th ...

First opened in 1970 and shut down in 2011, the Élan School was the "last resort" for parents of teens with behavioral problems — and allegedly a site of systemic abuse. For some, the idyllic woods of ...

These photos of the Dyatlov Pass Incident document the days leading up to the mysterious deaths of nine young hikers — and the investigation into their gruesome deaths.

In the 1970s, a serial killer targeted young girls in Rochester, New York who had the same first and last initials.

The Sea Peoples terrorized Egypt and the Mediterranean during the Bronze Age, but their identity and origins remain mysterious to this day.

On September 29, 1978, 15-year-old Mary Vincent accepted a ride from Lawrence Singleton, who then kidnapped her, raped her, and cut off both her arms.

Since 2011, investigators have considered every scenario regarding Phoenix Coldon's disappearance. From sex trafficking enslavement to purposefully running away — or being murdered.

The Piri Reis map was created in 1513, 260 years before James Cook discovered Antarctica. So why was it on this world map?

Philip Chism was just 14 when he murdered his 24-year-old math teacher Colleen Ritzer at Danvers High School before dumping her corpse behind the school.

In 1900, the lighthouse keepers on a remote Scottish island vanished. The official report called it an accident. But suspicious clues – and a puzzling logbook – point to a darker explanation.

The heart attack gun fired a dart made of frozen shellfish toxin that would enter the target's bloodstream and kill them in mere minutes without leaving a trace. In 1975, more than 30 years of almost ...

Experience the largely forgotten horrors of the Philippine-American War, one that seldom makes much of an impact in the history books.