The Space Needle was built in 1962 for the Worlds Fair
Top of the Space Needle - Aircraft Warning Beacon: 605 feet
Observation Deck: 520 feet

On a hot day the Space Needle expands about one inch.
During the construction of the Space Needle, it took 467 cement trucks less than 12 hours to fill the foundation hole (30-feet deep and 120-feet across); this was the largest continuous concrete pour ever attempted in the West.