# CN Tower 7 
Towering above the downtown, the iconic 553-meter (1,815.4 ft) CN Tower was built from 1973 to 1976.
The tower offers panoramic views of Toronto’s cityscape from two observation platforms (interior and outside).
Tower Height: 553 m / 1,815.4 ft | Observation Desk: 446.5 m / 1,464.9 ft | Built: from 1973 to 1976
by Wladyslaw / CC BY-SA 3.0
# Royal Ontario Museum 6 
Commonly referred to as the ROM, this museum houses in a spectacular building an outstanding collection of natural history, art, and culture from an immense variety of periods from all over the world.
by Aviad2001 / CC BY-SA 3.0
# Toronto Zoo 6
This world-class zoological park is home to over 5,000 animals representing more than 460 species.
Zoo Opened: 1974 | Land area: 287 hectares / 710 acres | Species: 460 | Animals: 5,000 | Annual Visitors (2013): 1,462,910 million
by Mehran Karimzadeh / CC BY-SA 4.0
# Ontario Science Centre 6
The family-oriented Ontario Science Centre features over five hundred exhibits, live demonstrations, Toronto’s only public planetarium, and IMAX® films in the dome theater.
by James Koole / CC BY-SA 2.0
# Casa Loma 5.5 
Constructed in 1914, this extravagant 98-room castle was the former home of Canadian financier Sir Henry Pellatt.
Residence Completed: 1914
by Torben T. Koch / CC BY-SA 2.0
# Art Gallery of Ontario (AGO) 5.5
Known as the AGO, this spectacular museum is best known for its enormous collection of Henry Moore sculptures and for its Canadian holdings.
by John / CC BY-SA 2.0
# Distillery Historic District 5.5
Experience the charm of Victorian Toronto in this historic pedestrian-only waterfront neighborhood.
by S. Rae / CC BY-SA 2.0
# Harbourfront Centre 5.5
Located on Toronto's waterfront, this lively 4-hectare art and entertainment complex hosts some 4,000 events a year in and around multipurpose venues. The center is home to festivals, stages, theaters, parks, and galleries.
by Mark Bradshaw / CC BY-SA 3.0
# Ripley's Aquarium of Canada 5.5
This aquarium features a 96 m-long underwater tunnel with a moving sidewalk and more than 450 distinct species.
While the Ripley's Aquarium of Canada just made it into our list of the thirty best aquariums in the world, it is still a great aquarium, and well worth a visit.
Aquarium Biggest Tank: 2.8 million liters | Tunnel: 96 m | Species: 450 | Established: 2013 | Rank in Our List of the Best Aquariums in the World: #30
by EuroCarGT / CC BY-SA 4.0
