Affectionately known as "the Manly wormhole", industrious fishermen chiselled the 40-metre Queenscliff Tunnel through the headland rock more than a century ago. Connecting Queenscliff and Freshwater beaches, this wind-worn passage is still the most direct route between the two seafronts (if you want to avoid cutting through any suburban streets). While it may be a bit of a challenge scrambling over the rocks north of Manly Beach to discover it, your efforts will be rewarded with stunning views of Freshwater Beach and bragging rights for finding one of the city's most historic secrets. Just be warned: it's safest in still weather; some have warned that big seas, high winds and changes of tides could make rocks slippery.
While you're in the neighbourhood: After an afternoon traversing Manly's rocky shores, you deserve a special treat. Pilu at Freshwater is not only one of the area's swankiest restaurants, specialising in Sardinian-centric Italian fare – it also has some of the most spectacular ocean views in the area.