Here it is, the namesake wall of Wall Street, depicted on a colorful mosaic at the (where else?) Wall Street subway station.
Built in the 1640s at the northernmost boundary of the young settlement, the half-mile wall was the idea of Dutch colonists, who wanted to keep British settlers and Native Americans out of New Amsterdam.
It didn’t exactly work—the English took over in 1664. The wall came down just before the 18th century.