A doorway cut with great precision into the face of a rocky mountain in Peru may be one of the world's greatest mysteries. Measuring 23 feet tall and 22ft wide, Aramu Muru has puzzled ...

The palazzo assumed a new range of roles, including as the French consulate’s HQ, which housed the famous ‘red line’: the Cold War telephone hotline between Moscow and Washington, designed ...

The doorway is carved into red sandstone, which is a softer material than granite. This enabled ancient people to carve out the structure just with simple tools at the time like stone, bone, and wood.