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Located at the mouth of the Niagara River where it flows from Lake Ontario, Fort Niagara is one of the oldest fortifications in North America. It was built by the French settlers of New France and later acquired by Great Britain and the United States, respectively.

Old Fort Niagara

Ft. Washington, Maryland, USA - June 1, 2016: Arched gate into Fort Washington, a military fort established in the 1800's to protect Washington DC situated on the Maryland side of the Potomac River

Charles Fort is a star fort located on the water's edge, at the southern end of the village of Summer Cove, on Kinsale harbor, Ireland. Shot in a particularly warm Summer in Ireland. Kinsale is a fishing village on the Southwest coast of Ireland in County Cork.

Sigulda, Latvia - August 10, 2025: Gate at New Castle of Sigulda. Sigulda New Castle built in 1878 in the Neo-Gothic style as the living house for the owners of the manor, the Kropotkin family. The building has changed its owners and functions several times. Since 1993, the Sigulda Region Council has been located in the castle.

Aerial view of Citadel Hill, a National Historic site in Halifax.

Historic Fort Ontario in Upstate New York, Oswego

Entrance of the Quebec city Citadel seen from the height of the fortification wall during a day of autumn

Bridge to the entrance of the 18thC Fort George, near Inverness, built after the Jacobite rising of 1745, Highland, Scotland, UK

Baltimore, USA - February 18, 2024. A man standing at the entrance of garrison at Fort McHenry National Monument and Historic Shrine, Baltimore, Maryland, USA

Ft. Washington, Maryland, USA - June 1, 2016: Bridge Entrance to Fort Washington, a military fort established in the 1800's to protect Washington DC situated on the Maryland side of the Potomac River

Tunnel of stone with light in the end, citadelle of Quebec city.

The gate of Louisbourg, Nova Scotia.

Quebec City: Entrance to citadel fortress with road and empty guards and nobody

Sally Port (gate) at Fort Jay on Governors Island in New York Harbor

Forest Lawn Cemetery in Buffalo, New York. Monuments, mausoleums and sculptures have attracted visitors for over 150 years.

Photo of Fort Morgan Gulf Shores Alabama USA

Fort WashingtonFort Washington

Terezska brana in Olomouc, Czech Republic.

Historic stone building with chimneys and courtyard cannons at the Halifax Citadel in Nova Scotia, photographed under an overcast summer sky in 2025.

Annapolis Royal, Nova Scotia, Canada - August 2023: View on the historic Fort Anne in Annapolis Royal, formerly known as Port Royal, Annapolis Royal has one of the oldest histories in North America. It was also Acadia's (and Nova Scotia's) capital. It is a National Historic Site of Canada.

Woman walking towards a monumental gate located in Peschiera del Garda, Italy, at the point where the Mincio River leaves Lake Garda.

Vaulted door

part of the roman Amphitheater in Trier

Fort Monroe in Hampton Virginia scenic shots including light house and buildings.

Garrison entrance of Fort KcHenry, Baltimore, Maryland, USA

Replica of the north gate of the Roman fort Biriciana in Weissenburg, Bavaria, Germany

Old fortress

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