Based on some slightly simplified math, here are approximate distances to an uninterrupted horizon from various viewing heights:
- 6 feet – slightly-above-average human eye level: 3 miles
- 20 feet – top of the roof of a typical one-story house: 5.5 miles
- 50 feet – short hill / top of a tree or boom truck: 8.7 miles
- 100 feet – ~10th story window : 12.3 miles
- 250 feet – ~20th floor of an office building: 19.4 miles
- 350 feet – top of the Cliffs of Dover: 22.9 miles
- 1050 feet – Empire State Building observation deck: 39.7 miles
- 1800 feet – observatory of Burj Khalifa : 52 miles
- 14,115 feet – top of Pike’s Peak: 145.6 miles