El Altar is also known as Kapak Urku, which means “Sublime Mountain” in Quechua. Spaniards named it the Altar because they thought it looked like a group of nuns and friars gathered at a church altar. El Altar is perhaps the most-demanding climb in Ecuador, and the trek includes stunning views of Andean valleys, rain forests, active volcanoes, and hundreds of shimmering lakes. Most tours are multi-day, high-altitude treks starting in Riobamba, which are perfect for those looking for moderate to strenuous exercise. Another great way to experience the mountain is aboard the Tren Crucero, a luxury train leaving through the Avenue of Volcanoes from Quito to Guayaquil on the Pacific Ocean — a swanky railway with all the bells and whistles.