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I assume you mean the Walls of Constantinople. They were originally built when the city was founded, in the 7th century BC. In the 5th century AD, the famous double line was constructed (the Theodosian wall). These were often imitated, such as at Caernarfon Castle in Wales.
It was home to tribes as early as 6th centruy. First castle and thus foundation for the city was however built in the 9th century.
Volcanic Rock
Prague Castle has origins in the 9th century and was enlarged and further fortified in the 13th century. It is a great place to visit. On the basis of archeological research and the oldest written sources it is thought that Prague Castle was founded around the year 880 by Prince Borivoj of the house of Premyslides.
White Castle was founded in 1921 in Wichita, Kansas.
best example is Edinburgh Castle, ScotlandDumbarton Castle- Dumbarton, Scotland is another example
The Southsea Castle was built in 1544 A.D., which was in the 16th century A.D.
Newcastle United was founded in 1892 officially.
The current castle was built in 1836 on the site of an 11th century castle.
Clonmacnoise is a monastic settlement that was founded in the year 545 by Saint Ciarán. Some of the current structures there date back to the 12th century.
one of the very first castles was the Motte & Bailey Castle.
Parts of the current castle were completed in the early 18th century. There had been a castle on the site as far back as the 13th century, but it was destroyed by fire in the late 17th century.