Turkmenistan's "Door to Hell," also called the Darvaza gas crater, is fueled by a reserve of methane gas below the surface — and scientists have no idea how long it will take to burn out.

Newton Knight led a small army of fugitive slaves and Confederate deserters to create the Free State of Jones.

Known for both eating his own feces and mutilating himself on stage, GG Allin was perhaps the most shocking musician in history — until his dramatic death at just 36 in 1993.

The segmented invertebrates known as tardigrades may be microscopic, but these indestructible "water bears" are planet Earth's most resilient creatures.

Though Frederick Valentich vanished almost 40 years ago, his unexplained disappearance still captures the attention of UFO hunters.

On April Fools’ Day 1957, BBC viewers watched a program about a "spaghetti tree" in Switzerland, and many were so convinced it was real that they wanted to grow their own.

The 1921 Tulsa Massacre left hundreds dead and caused over $1.5 million in damage while the city's famed "Black Wall Street" was destroyed — in just 24 hours.

A private campground in Monte Rio, California, Bohemian Grove hosts an all-male social club of rich and powerful members who want to "misbehave."

While studying nursing at UMass Amherst in February 2004, Maura Murray crashed her car in rural New Hampshire — then inexplicably disappeared forever.

Authorities found a map in Robert Hansen's Anchorage home marked with tiny "X" symbols, showing where the so-called "Butcher Baker" killed and buried his victims in the wilderness.

King Ludwig II of Bavaria spent years dreaming up Germany's Neuschwanstein Castle, the model Walt Disney would later use for "Sleeping Beauty."