Spike Island is an island of 103 acres in Cork Harbour, Ireland. Originally the site of a monastic settlement, the island is dominated by an 18th-century bastion fort now named Fort Mitchel.
The island's strategic location within the harbour meant it was used at times for defence and as a prison. Since the early 21st century the island has been developed as a heritage tourist attraction, with €5.5 million investment in exhibition and visitor spaces and accompanying tourism marketing. There were in excess of 81,000 visitors to the island during 2019, a 21% increase on 2018 numbers. Spike Island was named top European tourist attraction at the 2017 World Travel Awards.
Wikipedia https://en.wikipedia.org/wiki/Spike_Island,_County_Cork
Coordinates 51°50'2.601" N -8°17'8.925" E