Stanhope Road drill hall, Portsmouth

The fortifications of Portsmouth are extensive due to its strategic position on the English Channel and role as home to the Royal Navy. For this reason, Portsmouth was, by the 19th century, one of the most fortified cities in the world. The fortifications have evolved over the centuries in response to changes in tactics and technology and the area defended has increased. While the first defences focused on Portsmouth harbour, in step with the fortifications of Gosport, later defensive structures protected the whole of Portsea Island and an increasing distance inland. At the same time, the fortifications of Portsmouth and Gosport became part of the wider fortifications of the Solent. Old Portsmouth, on the southwest corner of Portsea Island, has been walled for much of its history.

The Diocese of Portsmouth (Latin: Dioecesis Portus Magni)is a Latin diocese of the Catholic Church that covers the Channel Islands as well as parts of England (Hampshire, the Isle of Wight and parts of Berkshire, Dorset and Oxfordshire). The episcopal see is St John's Cathedral in Portsmouth and is headed by the Bishop of Portsmouth. The diocese is part of the metropolitan Province of Southwark, which covers all of the far South of England as well as the Channel Islands.

Portsmouth Guildhall is a multi-use building in the centre of Portsmouth, Hampshire, England. It is located in a pedestrian square close to Portsmouth and Southsea railway station. Constructed in 1890, the building was known as Portsmouth Town Hall until 1926. It was heavily damaged by bombing during the Second World War and largely rebuilt during the 1950s by the English architect Ernest Berry Webber. It now operates as a concert, wedding and conference venue. It is a Grade II listed building.

Portsmouth & Southsea railway station is a Grade II listed building and the main railway station in the city of Portsmouth in Hampshire, England. It is in the Landport area close to the Commercial Road shopping area. British Transport Police maintain a presence at the station. There is a taxi rank at the front of the building and regular local buses within five minutes' walking distance. The station, which is managed by South Western Railway, has ticket barriers in operation.

Landport Drapery Bazaar was a department store located on Commercial Road, Portsmouth.

Portsmouth Civic Offices is a municipal building in Portsmouth, a city in Hampshire, in England. It is the administrative headquarters of Portsmouth City Council.

The Cathedral Church of St John the Evangelist (also known as St John's Cathedral) is a Roman Catholic cathedral in Portsmouth, England. It is the mother church of the Portsmouth diocese and seat of the Bishop of Portsmouth, currently the Right Reverend Philip Egan. It was dedicated on 10 August 1882. The cathedral is one of two cathedral churches in the city, the other being the Church of England Cathedral Church of St Thomas which is located about one mile to the south.

St Agatha's Church is a parish church in the Landport district of Portsmouth. It is now affiliated to the Roman Catholic Church through the Personal Ordinariate of Our Lady of Walsingham. It is situated on the Marketway next to the Cascades Shopping Centre. It was built between 1893 and 1895 for the Church of England and is a Grade II* listed building.

The New Theatre Royal is a Victorian Grade II* listed theatre in the heart of Portsmouth, England, with a capacity of 667. The theatre building was constructed in 1854 as Landport Hall. It was converted to a theatre two years later. It was rebuilt in 1884 by Charles J. Phipps and again in 1900 by Frank Matcham. The Theatre reopened in October 2015 after a £4.7M refurbishment project.

The Royal Portsmouth Hospital in Portsmouth, England was sited in Commercial Road close to the shopping centre and near to the Portsmouth Dockyard.

The Tricorn Centre was a shopping, nightclub and car park complex in Portsmouth, Hampshire, England. It was designed in the Brutalist style by Owen Luder and Rodney Gordon and took its name from the site's shape which from the air resembled a tricorn hat. Constructed in the mid-1960s, it was demolished in 2004. It was home to one of the first Virgin Megastores and housed the largest Laser Quest arena in Europe. The centre was a well-known example of 1960s architecture, and in the 1980s it was voted the 3rd ugliest building in the UK. In 2001, BBC Radio 4 listeners voted it the most hated building in the UK, and Charles, Prince of Wales described it as "a mildewed lump of elephant droppings", although it was much admired by others, who saw it as an irreplaceable example of Brutalist architecture. Demolition of the Tricorn began on 24 March 2004 and lasted approximately nine months. As of 2022, the site is a ground level car park for the city centre.

Portsmouth Courts of Justice is a Crown Court venue, which deals with criminal cases, and a County Court venue, which deals with civil cases, in Winston Churchill Avenue, Portsmouth, England.