Scotland, Ross and Cromarty, Eilean Donan Castle with its reflection in Loch Alsh.

Scotland, Ross and Cromarty, Eilean Donan Castle, evening view looking out towards Loch Alsh.

Scotland, Ross and Cromarty, Eilean Donan Castle.

USA, Washington DC, National Mall, Martin Luther King Junior Memorial.

USA, Washington DC, National Mall, Martin Luther King Junior Memorial, Jefferson Memorial in background.

USA, Washington DC, National Mall, Thomas Jefferson Memorial viewed across the Tidal Basin.

Bangladesh, Sunderbans, Shoots of halophytic mangrove poking out of the mud in the UNESCO World Heritage Site.

France, Bretagne, Barrage de la Rance, tidal power station. whirlpool caused by tidal water flowing down through electricity generators beneath the dam.

France, Bretagne, Barrage de la Rance, tidal power station. whirlpool caused by tidal water flowing down through electricity generators beneath the dam.

France, Bretagne, Barrage de la Rance, tidal power station. whirlpool caused by tidal water flowing down through electricity generators beneath the dam.

St. Brelade. Portelet Bay with Isle au Guerdain a tower built on a tidal island seen in the centreAlso known as Janvrins Tomb Named after Captain Janvrin buried there after he died of plague aboard h...

St. Brelade. Portelet Bay with Isle au Guerdain a tower built on a tidal island seen in the centreAlso known as Janvrins Tomb Named after Captain Janvrin buried there after he died of plague aboard h...