Fort Denison

⚠️ NOTE: Fort Denison is currently closed to visitors for conservation works until mid-2026.

Overview

Fort Denison is a small fortified island in Sydney Harbour, originally used as a convict punishment site known as "Pinchgut." The Martello tower, built in 1857 during Crimean War fears, now fires a cannon daily at 1 pm and hosts guided tours.

Highlights

• One O'Clock Gun: A cannon fired daily at 1:00 pm, a tradition since 1906.
• Martello tower: The only Martello tower built in Australia, modelled on Corsican coastal defences.
• Harbour views: 360° panoramic views of the harbour, Opera House, and bridge.

History

Named after convict Thomas Denison, the island was a place of punishment — Francis Morgan was left chained to the rock for two weeks in 1796. It was fortified during the Crimean War scare and served as a tide-gauge station.

Visitor Tips

• Ferry access: Accessible via harbour cruises or NPWS-operated ferries from Circular Quay.
• Pre-book: Tours and ferry must be booked in advance via nationalparks.nsw.gov.au.
• Duration: 45–60 minutes.