Lake Natron in northern Tanzania is so alkaline that just three species of fish can survive in its waters, and it calcifies birds that die on its shores.

A successful businessman in Fall River, Massachusetts, Andrew Borden was killed in an ax murder that claimed both him and his wife Abby on August 4, 1892.

Elasmotherium sibiricum was a massive rhinoceros that once lived in the grasslands of Eurasia and could grow to the size of an elephant.

Hundreds of nearly-identical castles were built onto the Turkish hillside at Burj al Babas — but not a soul lives there.

Step inside the enormous, otherworldly tunnels of Vietnam's Hang Son Doong Cave, the largest cave on the planet.

Around 10,000 years ago, most woolly mammoths vanished from the Earth — but a small herd survived on Wrangel Island off the coast of Siberia until 1650 B.C.E.

These pre-Instagram photos will take you back to the colorful shops, the noisy arcade, and the busy food court where you used to spend your Saturdays.

Jake Patterson decided to abduct 13-year-old Jayme Closs after seeing her get on the school bus at her Wisconsin home one morning in October 2018 — and then he held her captive for about three months.

Virginia Eliza Clemm was just 13 years old when she married 27-year-old Edgar Allan Poe — who was also her first cousin.

In the mid-1960s, Margaret Howe Lovatt was tasked with training and observing dolphins on St. Thomas. Over the years, she developed an intimate relationship with a dolphin named Peter.

These stunning autochromes, captured by French photographer Léon Busy, show what Vietnam really looked like during colonial times.