- Cadbury World - Bourneville, Birmingham
- Caddies Crazy Golf Southend - Southend-on-Sea, Essex
- Caerhays Castle and Gardens - St Austell
- California Country Park - Finchampstead, Wokingham
- Calke Abbey - Ticknall, Derby
- Calshot Castle - Calshot, Southampton
- Calypso Cove - Barnsley
- Cambridge Museum Of Technology - Cambridge
- Camelot Play Castle - Rotherham
- Camera Obscura and World of Illusions - Edinburgh
- Campfield Marsh - Nr. Bowness on Solway
- Candy Kingdom - Bridlington
- Cannon Hall Farm - Barnsley
- Canons Ashby House - Daventry
- Canterbury Roman Museum - Canterbury
- Cantlop Bridge - Condover, Shrewsbury
- Cantref Adventure Farm - Cantref, Brecon, Powys
- Captain Cook and Staithes Heritage Centre - Staithes, Near Whitby
- Captain Cook Birthplace Museum - Marton, Middlesbrough
- Captain Cook Schoolroom Museum - Great Ayton
- Captain Jack’s Adventure - Retford
- Captain Kids Adventure World - Skegness
- Carisbrooke Castle - Newport
- Carlisle Castle - Carlisle
- Carlyle’s House - Chelsea, London
- Carpetbagger Aviation Museum - Harrington
- Castaways Cove - Sheffield
- Castle Acre Priory - Castle Acre, King's Lynn
- Castle Ashby Gardens - Castle Ashby, Northampton
- Castle Bromwich Hall Gardens - Castle Bromwich, Birmingham
- Castle Cary and District Museum - Castle Cary
- Castle Drogo - Drewsteignton, near Exeter
- Castle Howard - York
- Castle Mania Indoor Adventure Play - Amble
- Catalyst Science Discovery Centre - Widnes
- Cattle Country Adventure Park - Berkeley
- Cawdor Castle - Cawdor, Nairn
- Cefn Mably Farm Park - Cefn Mably, Cardiff
- Centre for Life - Newcastle upon Tyne
- Chain Bridge Honey Farm - Horncliffe, Berwick upon Tweed
- Chard Museum - Chard
- Charlbury Museum - Charlbury
- Charlecote Mill - Hampton Lucy, Warwick
- Charlecote Park - Wellesbourne, Warwick
- Charles Dickens Birthplace Museum - Portsmouth
- Charles Dickens Museum - London
- Charlestown Shipwreck and Heritage Centre - Charlestown, St. Austell
- Charleys Ceramics - Ellesmere Port
- Charnwood Museum - Loughborough
- Chartwell - Westerham
- Chastleton House - Chastleton, near Moreton-in-Marsh
- Chatsworth House Chatsworth, Bakewell
- Cheddar Gorge - Cheddar
- Chedworth Roman Villa - Yanworth, near Cheltenham
- Cheeky Chimps Play Centre - Lees, Oldham
- Cheeky Monkeys - Bristol
- Cheeky Monkeys Jungle Adventure - Cheshunt
- Chenies Manor House - Chenies
- Cherryburn - Mickley, Stocksfield
- Chesham Museum - Chesham
- Cheshire Farm Ice Cream - Chester
- Chessington World of Adventures - Chessington
- Chester Cathedral - Chester
- Chester Zoo - Upton-by-Chester, Chester
- Chesters Roman Fort and Museum - Chollerford, Hexham
- Chestnut Centre Otter, Owl and Wildlife Park - Chapel-en-le-Frith
- Chichele College - Higham Ferrers
- Childsplay Adventureland - Colchester
- Chill Factore - Manchester
- Chillingham Castle - Chillingham, Alnwick
- Chilly Kiddy’s - Stourbridge
- Chiltern Open Air Museum - Chalfont St Giles
- China Butterfly Pottery Painting Studio - Formby
- Chislehurst Caves - Chislehurst
- Cholderton Charlie’s Farm - Cholderton, Salisbury
- Cholmondeley Castle Gardens - Malpas
- Christmas Tree Farm - Orpington
- Chucklebutties Play and Party Centre - Belper
- Church Farm Ardeley - Ardeley, Nr Stevenage
- Chysauster Ancient Village - Newmill, Penzance
- City of Caves - Nottingham
- City of Norwich Aviation Museum - Norwich
- Clacton Zoo - Clacton on Sea
- Clandon Park - West Clandon, Guildford
- Claremont Landscape Garden - Esher
- Claydon House - Middle Claydon, near Buckingham
- Cleeve Abbey - Washford, Watchet
- Clerkenhill Adventure Farm - Haverfordwest, Pembrokeshire
- Clifford’s Tower - York
- Clifton Suspension Bridge - Bristol
- Cliveden - Maidenhead
- Coalport China Museum - Telford
- Cobbaton Combat Collection - Chittlehampton, Umberleigh
- Cobble Hey Farm and Gardens - Garstang, Nr Preston
- Coconut Island - Redditch
- Coco’s Playbarn - Frodsham
- Cogges Manor Farm - Cogges, Witney
- Colby Woodland Garden - near Amroth, Pembrokeshire
- Colchester Zoo - Stanway, Colchester
- Colemans Petting Farm and Play Barns - Porchfield, near Newport, Isle of Wight
- Coleridge Cottage Nether Stowey, Bridgwater
- Collegiate Church of St Mary - Warwick
- Colman’s Mustard Shop and Museum - Norwich
- Congo Rapids Adventure Golf - Easton, Norwich
- Combe Martin Wildlife and Dinosaur Park - Combe Martin
- Come Into Play - Stone
- Compton Acres - Poole
- Compton Castle - Paignton
- Compton Verney - Warwickshire
- Congo River Crazy Golf - Blaby, Leicester
- Conisbrough Castle - Conisbrough, Doncaster
- Conkers - nr Swadlincote
- Conundrum Farm - Berwick upon Tweed
- Conwy Suspension Bridge - Conwy
- Corfe Castle - Corfe Castle, Wareham
- Corinium Museum - Cirencester
- Cornish Seal Sanctuary - Gweek
- Cornwall’s Crealy Great Adventure Park - Tredinnick, Wadebridge
- Cotebrook Shire Horse Centre - Cotebrook
- Cotehele - near Saltash
- Coton Manor Garden - Coton
- Cotswold Farm Park - Guiting Power, nr. Cheltenham
- Cotswold Motoring Museum and Toy Collection - Bourton-on-the-Water
- Cotswold Wildlife Park and Gardens - Burford
- Cottesbrooke Hall and Gardens - Northampton
- Coughton Court - Alcester
- Court Barn Museum - Chipping Campden
- Coventry Cathedral - Coventry
- Coventry Transport Museum - Coventry
- Crabble Corn Mill - River, Dover
- Crafty Corner - Liverpool
- Cragside - Rothbury, Morpeth
- Crash Bang Wallop - Brownhills
- Craven Museum and Gallery - Skipton
- Crazee Bongos - Sleaford
- Crazy Corner Adventure Play Centre - Stockton-on-Tees
- Crazy Kids Adventure Play - Braintree
- Crazy Monsters - Blandford Forum
- Crazy Town Ellesmere Port - Ellesmere Port
- Crazy Tykes - Wetherby
- Cream o’ Galloway - Gatehouse of Fleet, Castle Douglas
- Creations Pottery - Loughborough
- Creswell Crags - Worksop
- Crewkerne and District Museum - Crewkerne
- Crich Tramway Village - nr Matlock
- Crocodiles of the World - Crawley, Witney
- Croft Castle and Parkland - Yarpole, near Leominster
- Crofton Beam Engines - Crofton, Marlborough
- Cromer Museum - Cromer
- Crook Hall and Gardens - Sidegate
- Croome - Worcester
- Croxteth Hall and Country Park - Liverpool
- Cuckooland Museum - Tabley
- Cumberland House Natural History Museum - Southsea
- Curtis Museum - Alton
- CurveMotion - Bury St Edmunds
- Cusworth Hall, Museum and Park - Doncaster
- Cwmmau Farmhouse - Whitney-on-Wye
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