Incredible Discoveries Hidden in Plain Sight: The Unexpected Treasures Among Us

4. A woman from New York finds a hidden apartment behind a mirror

Location: New York's Roosevelt Island Year Found: 2021 Approximate Value: $1.9 million* Roosevelt Island Three-Bed Apartment Samantha Hartsoe, a resident in Roosevelt Island, New York, claims that she could "die" from curiosity after discovering something in her house fit for a horror film. While renovating, Hartsoe discovered that her bathroom mirror concealed a three-bedroom condominium.

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New Yorker Finds Hidden Apartment Behind Mirror @Pinterest/The Guardian It was the frigid drafts that gave her the notion to take down the mirror. She squeezed through the tiny gap behind the mirror and emerged into a spooky area where she discovered an empty water bottle and a mountain of rubbish bags. Everyone has been perplexed by the extra square footage found thus far, even the building administrators who were unaware of the apartment's existence until Hartsoe discovered it.\

5. A 12th-century bathhouse discovered in a Spanish bar

Where: Seville, Spain Year Found: 2021 Estimated Value: Not Known Serving food and beverages in the center of Seville, Spain, for almost a century, Cerveceria Giralda is a well-known pub. However, upon restorations, Giralda's proprietors learned that the bar was originally a twelfth-century bathhouse, so there's more to this establishment than meets the eye.

12th-century bathhouse discovered in a Spanish bar @Cnn/Pinterest Beautiful mosaics and artwork from the Almohad Caliphate, which at the time controlled Spain, were exposed as the paint was stripped off. Star-shaped skylights were also discovered by archaeologists. Carbon-dating the building is still being done, but researchers found that the fine craftsmanship made this a "beautiful" find.

6. Olduvai Gorge's Old Man

Location: Tanzania's Arusha Region's Ngorongoro District Discovered in 1911 Est. Value: Incalculable In 1911, German physician Wilhelm Kattwinkel was exploring the sleeping sickness parasite while he was in East Africa. There, in what would become known as Olduvai Gorge, he discovered the fossils of an extinct three-toed horse. Scientists descended upon the region when Kattwinkel informed other German experts about his discovery.

Primarily, the Olduvai Gorge is one of the most significant paleontological sites on Earth. © Shutterstock/Yakov Oskanov We have learned so much about early humans from the Tanzanian site, where hominid remains from 17,000 B.C. have been discovered. There was also proof of the use of stone tools, scavenging, hunting, and other activities. It is estimated that Olduvai was home to early human beings 1.9 million years ago.