Findings:

• Castle Amber
• Edinburgh Castle
• castle
• Roy Castle
• White Castle
• Castle Falkenstein
• Castle Forrester
• Elephant and Castle
• Castle Wolfenstein
• Charlottenburg Castle
• Castle of the Creeping Flesh
• Dark Castle
• Castle Rock, Maine
• How Candide Was Brought Up in a Magnificent Castle and How He Was Driven Thence
• Castle Anthrax
• Hearst Castle
• Takeshi's Castle
• Castle of Cagliostro
• Castle Grayskull
• Windsor Castle
• The Wilson Park Castle
• William Castle
• Cahir Castle
• Bunratty Castle
• The Man in the High Castle
• The Castle
• Criccieth Castle
• The Castle in the Attic
• Crystal Castles
• "Darn it all, and just after I sprayed the whole castle with FLIT!"
• St Donat's Castle
• Castle Class Patrol Vessel
• Castle Adventure
• Medieval European Castles
• Coral Castle
• Morro Castle Fire
• Alex Kidd in the Enchanted Castle
• Maiden Castle
• The Seven Virgins of Schonburg Castle
• Operation Castle
• The Castle of Llyr
• Star Castle
• Castles
• The Emperor's Tin Castle
• Castle Terabil
• Return to Castle Wolfenstein
• Bannerman's Castle
• Leeds Castle
• Castle of the Winds
• Clopper Castle
• It appears to be a sock castle of some kind
• The Magic Castle
• sand castle memories
• Sand castle
• Sand Castles
• Glamis Castle
• Toward Castle
• Vernon and Irene Castle
• Radical Castle
• Nottingham Castle
• Swallow Castle
• We have always lived in the castle, Shirley
• Smurfs: Rescue in Gargamel's Castle
• Slanes Castle
• Spanish Castle Magic
• Mars' Cheese Castle
• Warwick Castle
• Castle of Oeth and Anoeth
• The Castle of Otranto
• Bratton Castle
• Castle Master
• Castle of Illusion
• Castle Acre
• Bodiam Castle
• Elegiac Stanzas Suggested by a Picture of Peele Castle in a Storm
• The Castle Shisha Shack
• Borthwick Castle
• Slane Castle
• Vajdahunyad Castle
• Return to Castle Wolfenstein: MP_Beach
• Frank Castle
• Blarney Castle
• York Castle
• Montezuma Castle National Monument
• Kenilworth Castle
• Scottish castles
• The splendour falls on castle walls
• Castle Lager
• Cinderella's Castle
• Castle Drogo
• Castles of Germany
• Osaka Castle
• Castle Bravo
• We Have Always Lived in the Castle
• Moorfield Castle
• Castle Rackrent
• Winchester Castle
• Montezuma Castle
• Azuchi Castle
• Kilkenny Castle
• Rochester Castle
• Thank you Mario! But our princess is in another castle!
• Himeji Castle
• Haunted Castle
• Powis Castle
• Siege of Osaka Castle
• Duke Bluebeard's Castle
• The snow castle
• Knapp Castle
• Ralph Allen's Sham Castle
• Cosafa Castle Cup
• Building a castle entirely out of Mountain Dew cans
• Wawel Castle
• Howl's Moving Castle
• bouncy castle
• Castle Clinton
• Castles in the Air
• Lord Valentine's Castle
• Slains Castle
• Caerphilly Castle
• Castle Howard
• Defend Your Castle
• Cardigan Castle
• Dublin Castle
• Nijo Castle
• Japanese Castles
• Hikone Castle
• Edo Castle
• Berkeley Castle
• Chepstow Castle
• Dunster Castle
• Raglan Castle
• At Castle Wood
• Kumamoto Castle
• Cadbury Castle
• Pontefract Castle
• Conway Castle
• Scarborough Castle
• Hermitage Castle
• Kochi Castle
• The Castle of Fu-Manchu
• Harold and Kumar Go to White Castle
• Stirling Castle
• In the Wicker Castle
• Castle Walk
• Coningsburgh Castle
• Chillingham Castle
• Harlech Castle
• Castle Anthrax (user)
• Framlingham Castle
• Dumbarton Castle
• Glamorgan Castle
• Castle in the Sky
• Bolton Castle
• Kilcoe Castle
• Carisbrooke Castle
• Laken Castle
• Highclere Castle
• Castle Roogna
• Roxburgh Castle
• Clifford Castle
• Belvoir Castle
• Drumlanrig Castle
• Shirburn Castle
• Kimbolton Castle
• Bristol Castle
• Harbottle Castle
• Monmouth Castle
• Skipton Castle
• Appleby Castle
• Manorbier Castle
• Hawarden Castle
• Bedford Castle
• Castle Rock
• Castles in the Sun
• Norham Castle
• Alnwick Castle
• Tynemouth Castle
• Aboyne Castle
• I Capture the Castle
• Thornbury Castle
• Edwardian Castles
• Penrhyn Castle
• Pleshey Castle
• Castle of Indolence
• Hartlebury Castle
• A Thought of Sky and Castle
• Penhill Castle
• Riber Castle
• On the third night the castle burned down, leaving everyone to walk home in the dark
• Inveraray Castle
• Hever Castle
• Wemyss Castle
• Tantallon Castle

If you Log in you could create a "Prague Castle" node. If you don't already have an account, you can register here.