Castletown, Dorset

Portland Castle is an artillery fort constructed by Henry VIII on the Isle of Portland, Dorset, between 1539 and 1541. It formed part of the King's Device programme to protect against invasion from France and the Holy Roman Empire, and defended the Portland Roads anchorage. The fan-shaped castle was built from Portland stone, with a curved central tower and a gun battery, flanked by two angular wings. Shortly after its construction it was armed with eleven artillery pieces, intended for use against enemy shipping, operating in partnership with its sister castle of Sandsfoot on the other side of the anchorage. During the English Civil War, Portland was taken by the Royalist supporters of King Charles I, and then survived two sieges before finally surrendering to Parliament in 1646. Portland continued in use as a fort until the end of the Napoleonic Wars in 1815, when it was converted into a private house. Fresh concerns over invasion led to the War Office taking it over once again in 1869, but the castle was not rearmed and was instead formed accommodation for more modern neighbouring fortifications. During the First and Second World Wars it was used as offices, accommodation and as an ordnance store. In 1949, the War Office relinquished control, and in 1955 it was opened to the public by the state. In the 21st century it is managed by English Heritage and operated as a tourist attraction, receiving 22,207 visitors in 2010. Historic England consider the castle to form "one of the best preserved and best known examples" of King Henry's forts.

The Portland Royal Naval Hospital was a naval hospital on the Isle of Portland, Dorset, England. Serving HMNB Portland at Portland Harbour, the hospital is located close to Castletown. Discounting earlier, temporary incarnations of the hospital, the permanent naval hospital was built at the beginning of the 20th century. It closed in 1957, when it was handed over to the National Health Service, which still runs the hospital as NHS Portland Community Hospital.

The Portland Mulberry Harbour Phoenix Units are two reinforced concrete caissons, built as part of the artificial Mulberry harbours that were assembled as part of the follow-up to the Normandy landings during World War II. Out of a total of 148 produced units, two units still remain at the Isle of Portland, in Dorset, southern England. They are located at Portland Harbour, close to Queen's Pier. The two units became Grade II Listed in 1993.

The Phoenix breakwaters were a set of reinforced concrete caissons built as part of the artificial Mulberry harbours that were assembled as part of the preparations for the Normandy landings during World War II. They were constructed by civil engineering contractors around the coast of Britain. They were collected at Dungeness and Selsey, and then towed by tugboats across the English Channel and sunk to form the Mulberry harbour breakwaters replacing the initial "Gooseberry" block ships. Caissons were added in the autumn of 1944 to reinforce the existing structure to cope with the harbour continuing in use longer than planned. Several Phoenix breakwaters still exist in Britain: two are part of the harbour off Castletown at Portland Harbour in Dorset, and two can be dived in less than 10 metres of water off Pagham in West Sussex. There is also a smaller Phoenix Caisson (type C) in Langstone Harbour in Hampshire.A wrecked Phoenix breakwater is also to be seen, broken in two, in the Thames estuary off Shoeburyness in Essex. It broke while being towed from Harwich in June 1944. To avoid it causing a hazard to shipping in the Thames estuary, it was beached on the mud on the northern edge of the Thames dredged shipping channel. It is about a mile from the beach. It is not quite covered at high tide, but it is topped by a beacon to warn shipping of its presence. Several Phoenix breakwaters were used in the Netherlands to plug gaps in the dykes, four of them for a dyke at Ouwerkerk after the North Sea Flood of 1 February 1953. These four have now been converted into a museum for the floods called the Watersnoodmuseum. One can walk through the four caissons. Two of the Phoenix breakwaters were sold to Sweden in 1949, initially towed to Frihamnen port in Stockholm and moved on 20 September 1956 to the newly-built heat and power plant in Hässelby where they remain as of 2021.

Merchant's Railway was a horse drawn and cable operated incline railway on the Isle of Portland, Dorset, England, built for the stone trade on the island. It was the earliest railway in Dorset, opening in 1826. The railway ran two miles from many working quarries at the north of Tophill, along the edge of Verne Hill, to a pier at Castletown, from where the Portland stone was shipped. It was in operation from 1826 to 1939. Since becoming disused the original path of the railway has become a popular public footpath.

RNAS Portland was an air station of the Royal Navy from 1917. The site was first built in 1917 as HMS Sarepta within the confines of Portland Harbour as a seaplane base; the aircraft operating from the base's slipways. In 1959 it became RNAS Portland (HMS Osprey)

RNAS Portland (ICAO: EGDP) was an air station of the Royal Navy, situated at the Isle of Portland, Dorset, England. It was established in 1917 on the western edge of Portland Harbour as HMS Sarepta. From 1959 the station shared the name HMS Osprey, the anti-submarine establishment based at Portland, with helicopters used for research and development in anti-submarine techniques. RNAS Portland remained operational until 1999.

Royal Manor Theatre is a theatre located in Fortuneswell, Isle of Portland, Dorset, England. Formerly a Methodist chapel, the building was later converted into the Royal Manor Theatre, which opened in 1978.

Victoria Gardens is a public garden, located at Underhill, Isle of Portland, Dorset, England. It is found close to Fortuneswell village and overlooks both Victoria Square and Chiswell. The gardens, which were created to mark the 1897 Diamond Jubilee of Queen Victoria, have remained a focal point since their opening in 1904.The gardens are made up of grassed and formal bedding areas, with a large rockery running along its centre. There is a children's play area, tennis courts and a bowling green managed by the Portland Victoria Bowls Club.

Underhill is the name given to the area of very steep land, at the northern end of the Isle of Portland in Dorset, England, which contains the villages of Chiswell, Castletown and Fortuneswell. The remaining part of the island is known as Tophill. The geology of Underhill is different from Tophill; Underhill lies on a steep escarpment composed of Portland Sand, lying above a thicker layer of Kimmeridge Clay, which extends to Chesil Beach and Portland Harbour. This Kimmeridge Clay has resulted in a series of landslides, forming West Weares and East Weares.

Victoria Square is a public square on the Isle of Portland, Dorset, England. Developed in the 19th century, it is situated at the entrance to Portland, close to Chesil Beach, Osprey Quay, and the small fishing village of Chiswell.

Portland was a railway station on the Portland Branch Railway in the south of the English county of Dorset. The station opened with the Easton and Church Hope Railway, one of the constituent parts of a complex line, on 16 October 1865. The station was moved to a new site on the opening of the extension to Easton on 1 September 1902.After this, the old station was used as a goods station and depot. The extension was technically a separate railway, the Easton and Church Hope, although the branch was operated as one line throughout. The second Portland station had multiple platforms with canopies for the large staff of the Admiralty establishments around it. The station closed to passengers in 1952, although regular freight kept the line in use until 1965. The platforms and canopies survived until the mid-1970s when the site was absorbed by the base and demolished.