What two areas of the globe had the same type of structures being built around the same time, but were not connected?

The Mayan and Egyption pyramids were both build around 2500 BCE, but neither had any knowledge about the other. The two areas would be Central America and Egypt.

in the 1800s, locomotives powered by steam made transportation faster and cheaper. the resulting rapid growth of railroads led to the connection of the atlantic and pacific railroad in oklahoma city in 1897.

in the last years of the century, the improvement of steam-based engines the expansion and growth of railroads. this growth increased when the companies started to build and expand, such as the atlantic and pacific railroad, which connected new mexico with california, and missouri with oklahoma. many of these new networks were built in oklahoma, and these changes transportation henceforward.