Why didn't the Chinese build castles?

 To a medieval European lord, a stone castle was the ultimate defense. To a Chinese emperor, a private fortress was an act of treason—and a death trap against an army of 100,000.

For most of its history, China was a unified empire managed by bureaucrats, not a patchwork of warring hereditary lords. Since the state held a monopoly on military power, resources were directed toward massive walled cities rather than local keeps. A regional administrative hub like Xi'an or Pingyao housed the governor, a state-controlled garrison, and the civilian population behind fortifications up to 40 feet thick.

The sheer scale of warfare also rendered European-style architecture obsolete. While Western castles were designed to withstand sieges by forces numbering in the hundreds or thousands, imperial Chinese armies utilized advanced siege technology—including traction trebuchets, heavy crossbows, and early gunpowder artillery—centuries before Europe. A standalone stone tower would simply be bypassed or obliterated. To survive a siege, defenses had to be large enough to hold a massive garrison and resilient enough to absorb heavy bombardment. Builders relied on rammed earth for these walls. While solid stone shatters under artillery fire, tightly packed earthen cores absorb kinetic impacts.

There were exceptions, and they demonstrate exactly why the rule existed. In rugged regions where central authority was weak and banditry was common, locals did build castle-like structures. In the mountainous southeast, the Hakka people constructed tulou—massive, multi-story earthen fortresses that enclosed entire clan communities. Unlike European castles built for an aristocratic lord, these were communal strongholds built for collective defense when the imperial army was too far away to help.

A cluster of traditional earthen tulou buildings in Fujian province. Photo by Gisling is licensed under CC BY-SA 4.0.

How do they build lighthouses in the middle of the ocean?

 The Lighthouse That Couldn't Defy Gravity.

Then in 1939 a handful of men conceived the idea of doing something which seemed to be crazy, to construct a lighthouse on Þrídrangar, three inaccessible rocks jutting out of the freezing North Atlantic off of Iceland. No land. No shelter. Just wind, waves, and stone.

It sounded impossible. But they did it anyway.

They must climb it first,--and that was almost suicide. The cliffs were even wet walls of rock, slippery and cold. They possessed neither gear, nor ropes, nor safety. Where the ascent proved too steep a human ladder was made, the one man standing on the shoulders of the next and the other drawing him up.

A method of transporting people had to be developed before construction. So they cut metal spikes into the cliff and bound them together--a tremulous way of iron floating on the sea. Then there was the supplies, buckets of cement, rowed up out of boats below one after the other, in the teeth of cold wind and smashing water.

A month they had to work that way. No dock. No break. Just survival.

And as the end of it came, there was a lighthouse on a point where no-one believed men could even stand.

It still remains there, alone, silent and laughing at gravity.

Which person of the Nazi regime was the most despised by the Germans themselves during WW2?

World War 2 was a difficult time not knowing which of the leaders of the Nazi party Germans disliked most. The government was highly strict(Read full)