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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

Aylesford is a small village on the banks of the River Medway, north west of Maidstone. The village has a long history and contains many old buildings, including a mediaeval bridge and The Friars Link (a Carmelite monastery). Today the village has two pubs, a post office and several shops. the railway came in 1856.

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

This old single track bridge crosses the River Medway. Originally built in 1250 of local Ragstone. It has five arches, the largest being the central arch. However, prior to 1881, this large arch was two arches. In 1881 it was enlarged into one long arch.
The bridge today is no longer used for traffic, as the traffic now uses a new modern bridge just up river. The bridge, however, is open for pedestrians.
Grade I listed. Link & a scheduled monument.