CN Tower
Height records
Table:
Record

Owner

Value

Time period

Succeeded by

World's tallest free-standing structure
CN Tower
553.33 metres (1,815.4 ft)
March 31, 1975 to September 12, 2007
Burj Khalifa

World's tallest tower
CN Tower
553.33 metres (1,815.4 ft)
1975 to 2009
Canton Tower

World's highest public observation gallery
SkyPod
447 metres (1,467 ft)

World's highest glass floor paneled elevator
CN Tower
346 metres (1,135 ft)
2008 to present
—

World's longest metal staircase
CN Tower
2,579 steps

World's highest glass floor
CN Tower
342 metres (1,122 ft)
2008 to July 2, 2009
Willis Tower

World's highest and largest revolving restaurant
360 Restaurant
351 metres (1,152 ft)

World's highest bar
Horizons Restaurant
346 metres (1,135 ft)
September 21, 2009 to present
—

World's highest wine cellar
360 Restaurant
351 metres (1,152 ft)

Using the following table concerning 'CN Tower' titled 'Height records', write a one-sentence description of the highlighted cells and provide it inside the JSON object {"answer": "YOUR ANSWER"}.