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

Along with a history of racist wartime propaganda, other forms of hateful posters and political flyers were persistent throughout the 20th century. The infamous white supremacist group Ku Klux Klan ...

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.

Wild West outlaw Billy the Kid died in 1881 — or did he escape, vanish, and live on under the name Brushy Bill Roberts in Texas all the way until 1950? In the late 1800s, the American Wild West was ...

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 ...

Over the years, more than 20,000 people have vanished in the region between Anchorage, Juneau, and Utqiagvik known as the "Bermuda Triangle of Alaska." ...

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

According to centuries-old Mexican and Tejano folklore, La Lechuza is a bloodthirsty, shapeshifting owl with the face of an old witch known as a bruja.

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

These rare, declassified Vietnam War photos taken by the U.S. Army reveal a side of the conflict that few have ever seen.

A 200-square-mile area in southeastern Massachusetts, the Bridgewater Triangle has long been known as a vortex of unexplained phenomena.