Roundhouse Fremantle

From the website.
http://www.fremantlewa.com.au/accom_result1/round-house-and-whalers-tunnel/

The Roundhouse : The Round House stands at the Western end of High Street on Arthur Head, a high promontory overlooking Bathers Beach and the Indian Ocean. The twelve-sided building was purpose-built as a gaol in 1831 to house locals who broke the law.

The Whalers Tunnel :The tunnel below the Round House was built by the Fremantle Whaling Company in 1837 to allow the company easy access between Fremantle town and Bathers Beach.