In a country known for chilly winters, the Allan Gardens Conservatory is a pleasant green surprise. The stunning domed conservatory, all cast iron and glass, opened in 1910. The greenhouses—16,000 square feet in all—are divided into separate buildings, each with a distinct botanical zone. Bananas and palms thrive in the steamy Palm House; in the Arid House, succulents, euphorbia, and cacti defy the Canadian climate outside. Surrounding the conservatory is one of Toronto’s oldest parks, ideal for people-watching during the warmer months.