Rare photos that place you in the middle of assassinations you've read about but perhaps never seen.

From who really built the pyramids to Cleopatra's favorite prank, these are the most fascinating Ancient Egypt facts you'll ever read.

Experience the Isle of Wight Festival 1970 — likely the single largest event of the original hippie era — and the other early years of the British Woodstock.

From the story of "the Brooklyn Vampire" to the tale of "the Pig Farmer," these are the best serial killer documentaries guaranteed to keep you up all night.

From the BTK Killer to Ed Kemper — who beat his own other to death with a hammer — the real serial killers of "Mindhunter" fame committed acts too brutal for even the show to depict.

As out-there as the Hollow Earth theory may have been, it had at least one U.S. president among its supporters.

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

These interesting facts about history were never taught to you by your teachers — and they probably never even knew.

Witness the birth of rock's most revered group, in photos.

Humanity's greatest thinkers couldn't stop pondering these questions, and you won't be able to either.

Why more Americans should remember the largely forgotten Philippine-American War.