Michele Westmorland / Schooling fish around healthy reef system, Castle Rock, Komodo National Park, Indonesia.
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Carol Walker / Purebred black Friesian stallion being trained to perform the 'spanish walk', Castle Rock, Colorado, USA Model released
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Tim Fitzharris / Castle Rock overlooking Lake Superior, Pictured Rocks National Lakeshore, Michigan
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Juan Carlos Munoz / View across fields and drystone walls to O'Brien's Castle. Inisheer, Aran Islands, County Galway, Republic of Ireland. May 2011.
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Marie Lochman / Castle Rock, Porongurup National Park, south west, Western Australia, March 2012
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Ernie Janes / Tantallon Castle, East Lothian, on the Firth of Forth, with Bass Rock and the Gannet (Morus bassanus) colony, in distance, UK, July 2018.
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Jeff Foott / Rock formation in winter, The Castle, Capitol Reef National Park, Utah
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Jeff Foott / Rock formation in winter, The Castle, Capitol Reef National Park, Utah
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Jeff Foott / Rock formation, The Castle, Capitol Reef National Park, Utah
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Ashley Cooper / La Calahorra Castle in La Calahorra at the foot of the Sierra Nevada mountains in Andalucia, Spain,
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Ashley Cooper / La Calahorra Castle in La Calahorra with spring flowers, at the foot of the Sierra Nevada mountains in Andalucia, Spain.
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Nick Upton / Ancient stone staircase with 913 steps zigzagging up to Palamidi Castle, a Venetian fortress on a hill overlooking Nafplio and the Argolic Gulf, Argolis, Peloponnese, Greece, July.