architecture blue building castle circular classic defense defensive fort green sky stone style tower tree trees vegetation ancient Catalan catalonia Catalunya curved door historical landmark old rock round Spain spanish watchtower archway Dorset England english facade feature Forde Abbey glass Great Britain pillars portico window arches Buckinghamshire Dashwood Mausoleum hilltop structure West Wycombe brick colonnade elements empty light madrid palace Palacio Real passageway space college courtyard flagstones London marshalling yard pavement quad windows background beige brown building material mortar pattern rectangle stone wall texture vintage access Bolzano closed entrance house Italy medieval planks stones street wall wood art bridge chain city construction decoration design detail granite grey river Russia sunny water conical doorway dordogne France french hunter hut roof shelter steps traditional vineyard grapes vines