The most famous would be the Giants Causeway.
Giants Causeway & the Wall of Derry are important landmarks. Some popular mountains are Slieve Gullion, Slieve Donard, Black Mountain & Belmore Mountain.
Northern Ireland does not own any country. Northern Ireland itself is part of the United Kingdom, which may be what you mean.
No, Northern Ireland is a part of the UK.
Northern Ireland is part of the island of Ireland.
There is no toll charge on the M1 or any road in Northern Ireland.
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No! Don't be thick! And there isn't any need to write "the" before Northern Ireland.
There are buildings in Ireland that are over 5000 years old, right up to buildings currently under construction, so no one year can be said to be when Ireland's architecture was made. Georgian architecture is particularly famous in Ireland's cities, but that cannot be attributed to any one year. Georgian architecture refers to styles of buildings built in the 18th and 19th centuries, and buildings similar to those, that have been built at other times.
The Professional Tattoo Academy in Northern Ireland could help you do a tattoo course.
yes
Yes
It should be fine as it is. As long as your initial marriage is legal, there shouldn't be any need to register it in Northern Ireland. It will be recognised.
No. The Roman Empire got as far as Britain, Ireland's neighbouring island, but never reached Ireland. In any case, Northern Ireland only came into existence in 1922, long after the Roman Empire ended. It also ended long before Britain had any role in Ireland. So Northern Ireland was never part of the Roman empire.