Dover Castle, Kent - one of the best castles I have visited and so much history.....used through WWII for many different purposes......there are 4 miles of underground tunnels that were used as a hospital during WWII.....built on the White Cliffs of Dover
Pontcysyllte Aqueduct, nr Wrexham in Wales. One of the major engineering triumphs of Thomas Telford's remarkable career, The Pontcyslite Aquaduct carries the Shropshire Union Canal across the River Dee. The aquaduct is 127 feet above the valley floor
The Royal Observatory, Greenwich, London founded in 1675. The site of the Prime Meridian as well as the origin of Greenwich Mean Time, now the Observatory's historic buildings house a museum of astronomy, navigation and timekeeping as well as the Weller Galleries of modern astronomy and the award winning Peter Harrison Planetarium.