Mount Soufrière

Known as the island’s “drive-in volcano”—a confusing moniker, because you can drive up to but hardly into it—Mount Soufrière is worth a stop if it’s your first time on the island (a visit can be combined with one to the nearby Diamond Falls Botanical Gardens). Some 40,000 years ago, the volcano is believed to have measured eight miles in diameter before it erupted and fell in on itself. It’s technically still active today, but it has morphed into a massive area of boiling sulfur springs, which emit gases that have the distinctive smell of rotten eggs. A viewing platform overlooks a rocky, lunar-like landscape filled with bubbling sulfur pools.