Height (low side)55.9 m
834Tennis ball diameters
3,119Dime diameters
27,930Ant body lengths
Photo from Wikimedia Commons
Leaning Tower of Pisa
The world's most famous construction mistake/Ancient Structures
The Tower of Pisa began leaning during construction in 1173 when the soft ground on one side compressed more than the other. It took 199 years to complete (partly because of wars and partly because nobody knew how to fix the lean). The tower is 56 meters tall on the low side and leans at about 3.97 degrees. Engineering work in the 2000s stabilized it for at least another 200 years.
Measurements
Height (high side)56.7 m
584Softball circumferences
28.9Dwayne The Rock Johnsons
38.6Danny DeVitos
Base diameter15.5 m
1,292Skittles
34.8 millionthsGrand Canyon lengths
6.2 tenthsClock tower heights
Weight14.5 million kg
186Space Shuttle orbiters
14.5 trillionGrains of sand
2.7 millionUnabridged dictionaries
14,500 tonnes
Lean offset at top3.9 m
68.4House keys
65Thumb lengths
6Oboe lengths
From vertical
Age (as of 2026)26.9 billion s
14.9 millionDog walks
852Earth years
9 billionGoldfish memories
Started 1173, about 853 years