What is now a popular destination for history buffs once served as a defense facility that kept watch over the bay. Fort Denison Island, located northeast of the Royal Botanic Gardens, was where some of the most gruesome acts against convicted felons took place.
Today, travelers can wander the grounds of this recently restored island and see the gibbet where criminals were hanged. Explore the fort built to protect the island from invaders and climb the historic Martello Tower, the only one of its kind in the country. The island is home to an informative museum, as well as a number of landmarks that illustrate its dark and violent past.