Pedra da Gávea rises 842 metres above Barra da Tijuca, making it the world's tallest coastal monolith accessed entirely by foot. The granite block was formed 560 million years ago during the Precambrian era, its western face carved by tectonic uplift and centuries of Atlantic weather into a near-vertical slab that Portuguese sailors mistook for a topsail—hence gávea, the nautical term for a lookout platform. Indigenous Tamoio communities considered the summit a sacred threshold between earth and sky, and 19th-century explorers reported inscriptions on the rock face that fueled decades of debate over pre-Columbian Phoenician contact, a theory since dismissed by archaeologists but still whispered among guides. Today the peak anchors the southern boundary of Parque Nacional da Tijuca, the world's largest urban reforested area, replanted in the 1860s after coffee plantations stripped the watershed bare. The pedra da gavea hike tour follows a three-hour ascent through secondary Atlantic rainforest—strangler figs, bromeliads clinging to moss-draped boulders, and kapok trees whose roots have pried open colonial-era stone walls. At 600 metres the trail narrows to Carrasqueira, a 15-metre rock chimney climbed via embedded iron rebar and rope assists, installed by the Brazilian Climbing Club in 1979 and replaced every four years. The final pitch requires a short scramble across exposed granite before the summit plateau opens onto 360-degree views: Dois Irmãos and Corcovado to the east, the Tijuca massif inland, and the Atlantic stretching unbroken to the horizon. The mountain's notoriety grew in the 1990s when hang gliders began launching from the summit, and by the mid-2000s it had become Rio's most technical day hike accessible without technical climbing gear. Guides now lead pedra da gavea hike tour tours daily, carrying helmets and harnesses for the Carrasqueira section, where a false hold or misstep can mean a three-metre fall onto granite. The descent takes two hours, most of it a controlled slide down root-lined channels polished smooth by decades of boot traffic. Trailheads open at 08:00, and the park enforces a 17:00 closure to prevent hikers from descending in darkness, a rule tightened after a 2018 rescue operation required helicopter extraction of twelve climbers caught in fog.