We're not talking skyscrapers – imagine structures so massive they redefine the very concept of scale. Get ready to have your mind blown as we count down the 25 most colossal human-made structures you ...

In the city of Anuradhapura in Sri Lanka stands an engineering monument built more than 1,700 years ago and considered the ...

In Indonesia’s Gunung Padang site, a massive megalithic pyramid structure has been claimed to date back 25,000 years, predating Egypt’s Great Pyramid of Giza by over 20,000 years and challenging ...

Dams and levees are critical pieces of our infrastructure and our history. They're one of the oldest type of human-made structures on the planet, and they were one of the first things that that ...

In 1986, Kihachiro Aratake was diving off the coast of Yonaguni when he spotted a giant structure 25 meters below the surface ...

PAWHUSKA, Okla. — The Osage Nation had reacquired Sugarloaf Mound, a sacred Osage site and the oldest human-made structure in St. Louis. The Osage Nation Historic Preservation Office (ONHPO) announced ...