Between the 9th and 12th centuries AD.
Tomas ash discovered the round tower in lusk
Irish Hills Towers was created in 1924.
NO
Round tower castles were first built in the late 10th century, primarily in Ireland and parts of Scotland. These structures were designed as defensive fortifications and served various purposes, including as bell towers and places of refuge. The round shape provided enhanced strength against attacks, distinguishing them from more traditional square towers. Their construction continued into the medieval period, reflecting advancements in military architecture.
Nantyglo Round Towers was created in 1816.
the petronas towers were built in 1998
The Martello Towers were built in 1846... that is what i know :P
it was built in 1975
it was built in 1975
The twin towers were built in 1973.
the twin towers were built by very large machinery and they also took a while to build them
The defences of a concentric castle were round towers - It was harder for attackers to make round towers collapse. Unlike square towers they had no corners, which collapsed if holes were dug underneath the foundations.