Derry/Londonderry (depending on your political persuasion!!) is the only remaining completely intact walled city in Ireland and one of the finest examples of a walled city in Europe. As the last walled city to be built in Europe, the walls stand almost complete and spectacular. The Walls were built in 1613–1619 by The Honourable The Irish Society as defences for the early 17th century settlers from England and Scotland. The Walls, which are approximately 1 mile (1.6 kms) in circumference and which vary in height and width between 3.7 and 10.7 metres (12 and 35 feet), are completely intact and form a walkway around the inner city. They provide a unique promenade to view the layout of the original town which still preserves its Renaissance style street plan. It is one of the few cities in Europe that never saw its fortifications breached, withstanding several sieges including one in 1689 which lasted 105 days, hence the city's nickname, The Maiden City.

The Guildhall is a building in which the elected members the local council meet. Derry's original 17th-century Guildhall reflected the status of Londonderry which had a name change when it was given to the City & Guilds of London. The building was destroyed by fire in Victorian times. Work started on the new Guildhall in 1887 and it was opened in July 1890.