Built by attorney Phillip Weidner, the Dr. Seuss House is 185 feet tall and has stunning views of the surrounding landscape — but it's still unfinished after more than 20 years.

On August 15, 1916, Private Malcolm Alexander Neville penned this two-page note to his mother, reporting on his voyage toward Europe and asking whoever found the bottle to deliver it to her.

Due to its small, pony-sized body and horn-less skull, researchers were initially baffled as to what Epiaceratherium itjilik was, calling the creature "a little bit of a weirdo."

Emily Roebling's husband was the chief engineer of the Brooklyn Bridge, but when he fell ill soon after construction began, Emily spent over a decade working as his liaison, supervising the site, and ensuring that the structure was built to his specifications.

Enrico Tosti-Croce long believed the piece of marble his father brought back from the Acropolis of Athens in the 1930s was from the Parthenon, but experts say it's part of the Hekatompedon, which was built a century earlier.

Over 10 weeks in 1946, a predator known only as the "Phantom Killer" attacked four sets of couples in Texarkana, leaving five people dead, before vanishing completely.

Nanotyrannus lancensis was half the height of a Tyrannosaurus rex and just one-tenth of its body mass, leading it to be misidentified as a "teen rex" on multiple occasions.

Both artifacts were uncovered at Rustavi Fortress, and they're the first medieval objects of their kind found in the South Caucasus region.

Forged circa 1558, this sword was a type of elite weapon known as a degen that was reserved only for the upper class.

The 2,200-year-old coin is made of 99 percent pure gold and features an animal's face on one side and Celtic symbols on the other.