Though it has now been eclipsed as the world's tallest structure (by the Burj Dubai), the CN Tower held the title for an impressive 30 years. Some quip that the best thing about the tower is that, when inside, you don't have to look at it. Completed in 1976 by the railway giant Canadian National, this pillar of hollow concrete stands 553m (1,815ft) high and is basically a big radio antenna - and tourist attraction. Visitors are in awe of its height, and locals are pleased to have such clear TV reception. The tower is twice as tall as its closest competitor in the city, and it's astounding to watch the surrounding 40- and 50-storey buildings fall away below you from the glass elevator. The basic ticket takes you up to the 346-metre (1,136-foot) Look Out Level, where there are indoor and outdoor observation decks, plus a nerve-jangling section of glass floor. The Horizons Café is cheaper than the tower's swanky, rotating restaurant, 360 (416 362 5411).
From here you can pay an extra $10 to reach the Sky Pod - another 30 storeys up - to a height of 447m (1,467ft). The experience is breathtaking, especially on windy days, when you can feel the building sway. Vertigo sufferers can head to the basement for a documentary on the construction of the tower, as well as a vast gift store.