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The Crom Estate is a nature reserve located in the south of County Fermanagh, along the shores of Upper Lough Erne. It is owned and managed by the National Trust. The estate comprises 1,350 acres, composed primarily of riparian forest.
The estate is open to the public for recreational activities and weddings.
Like many Ulster country estates, the first house at Crom was built by a Scottish Planter at the beginning of the 17th century. In 1611, as part of the Plantation of Ulster, Michael Balfour, the Laird of Mountwhinney, constructed a house on the lough shore opposite Inishfendra Island. It was burnt down in the early 1760s. The ruins of this castle still survive today. In 1840 a new neo-Tudor Crom Castle was built, designed by Scottish architect Edward Blore. It remains the property of the Earl of Erne and is not open to the public. The estate was given to the National Trust by The 6th Earl of Erne in 1987.

A National Trust is an organization dedicated to preserving the cultural or environmental treasures of a particular geographic region. They generally operate as private non-profit organizations, although some receive considerable support from their national government. The first such organization was the National Trust for Places of Historic Interest or Natural Beauty, which is the National Trust of England, Wales and Northern Ireland, formed in 1895 and operating as a charitable organisation.

Extract from Wikipedia Link

List of National Trust places Link

In the United Kingdom, a scheduled monument is a 'nationally important' archaeological site or historic building, given protection against unauthorised change.
There are about 20,000 scheduled monuments in England representing about 37,000 heritage assets. Of the tens of thousands of scheduled monuments in the UK, most are inconspicuous archaeological sites, but some are large ruins.
Wikipedia: Link