Recently, China unveiled one of the most terrifying structures made by man. No, it’s not a creepy castle or a tunnel of pitch-black darkness. What we’re referring to is the world’s longest glass-bottomed bridge located in Shiniuzhai Geopark in Hunan–and it’s not for the faint of heart. Crossing it is a rather horrifying ordeal, as the combination of the see-through glass and the seemingly endless walkway would make anyone feel uneasy, to say the least. They don’t refer to this as the “hero bridge” for nothing.