Volcanoes: these solitary, stark mountains with the capability to destroy entire civilizations have always captured our imagination. Around the world, there are bike climbs that go up volcanoes - both dormant and very, very active! (see Mauna Loa, road covered by a lava flow in late 2022). These roads usually lead to observatories, scientific research facilities, and visitor centers. Many of these rides up volcanoes turn out to be some of the hardest climbs in the world!