So what's the deal with all these walls? We have the Great Wall of China, Hadrian's Wall, The Great Wall of Gorgon, the Maginot Line, The Berlin Wall, now the Wall between US and Mexico. How often do walls really work as advertised and is there some deeper meaning to them than just defense?

hi! there's lots of room for more input here - particularly in comparing/contrasting the purposes of the walls listed - but meanwhile, you might get something useful out of a few previous posts

Great Wall of China

Did the Great Wall of China work? -- includes links to a few more
Why did the Chinese spend soo much resources on building the Great Wall instead of spending those resources on defeating the mongols.

Hadrian's Wall

Just how hard would it have actually been to get over/around/through Hadrian's Wall?
How accurate is the idea that the Roman empire ended at Hadrian's Wall?

Maginot Line

Was the Maginot Line really a huge blunder for France?
Why didn't the French heavily reinforce the Belgian portion of the Maginot Line?

Berlin Wall

What was the Berlin wall?
How Did the DDR and USSR Justify the Berlin Wall?