Located on the western tip of Pulau Blakang Mati (known today as Sentosa Island), Fort Siloso was one of the many coastal fortifications built around the 19th century by the British and remains the most intact fortification in Singapore.

Fort Siloso, located on Sentosa Island in Singapore, was built by the British colonial government between 1874 and 1885. The project was part of a larger defensive strategy to protect the western entrance to Keppel Harbour, which was a vital strategic port for the British Empire in the Far East. The fort was named after the Malay word "Siloso," meaning "rock." It was primarily designed to house heavy artillery batteries to repel naval attacks. During World War II, the fort was modernized and played a role in the defense of Singapore in 1942, although its guns were notoriously pointed seaward and had limited effectiveness against the Japanese who invaded from the north via land. Following the British withdrawal and Singapore's independence, the fort was converted into a military museum. In 2022, it was gazetted as a National Monument of Singapore, and in 2026 it stands as the country's only well-preserved coastal fort, serving as a powerful educational site regarding Singapore’s colonial history and wartime experiences.