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Dating back to 1320, Ightham Mote is a Grade I listed moated medieval manor house, now owned by the National Trust and open to the public.

The timber framed building includes a Great Hall, crypt, Tudor chapel with a hand-painted ceiling and the apartments of the American donor Charles Henry Robinson. In the central courtyard is found the UK's only (Grade 1) listed dog kennel.
The site also has formal gardens, ponds and woodland for visitors to wander.

Grade I listed buildings and structures are of exceptional, even international importance. There are over 6,000 in the country. Only 2.5% of listed buildings are Grade I listed.
In Scotland the classification is Category A
Index: 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