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**1. Tallest Buildings and Structures:**
– Burj Khalifa in Dubai is the world’s tallest building.
– CN Tower in Toronto was the tallest freestanding structure from 1975 to 2007.
– Taipei 101 in Taiwan set records in several skyscraper categories.
– Engineers use various definitions for categories of buildings and structures.
– Warsaw radio mast held the height record from 1974 to 1991.

**2. Tallest Towers:**
– Tokyo Skytree is the tallest tower in the world at 634m.
– Tokyo Tower was the tallest tower from 1958 to 1967.
– Tokyo Skytree surpassed Tokyo Tower as the tallest tower.
– Pharos Lighthouse and Eiffel Tower were historical tallest towers.
– Canton Tower and Tokyo Skytree are among the tallest towers.

**3. Freestanding Structures:**
– Burj Khalifa in Dubai is the tallest freestanding structure on land.
– CN Tower in Toronto is a prominent freestanding structure.
– Lotte World Tower in Seoul is a notable freestanding structure.
– Structures must not be supported by guy wires or the sea to be considered freestanding.
– The definition excludes structures built underground or on the seabed.

**4. Observation Decks and Guyed Structures:**
– CN Tower in Toronto has an observation deck at 446.5m above ground.
– Willis Tower in Chicago has an observation deck at 412.4m above ground.
– Grand Canyon Skywalk protrudes 21m over the Grand Canyon.
– WIVB-TV Tower in New York is a tall guyed structure at 321.9m.
– KOBR-TV Tower in New Mexico is a significant guyed structure at 490.7m.

**5. Historical Tallest Structures:**
– Göbekli Tepe in Anatolia held the record around 9500 BCE at 1,500 meters.
– Great Pyramid of Giza in Egypt held the record around 2570 BCE at 146.6 meters.
– Willis Tower held the record for the tallest building from 1978 to 2000.
– World Trade Center (WTC) North Tower held the height-to-tip record with its antenna height.
– Eiffel Tower in Paris, France, stood at 312m tall.