It's about one-and-four-fifths times as tall as a Giant Sequoia (tree)
In other words, 612 spans is 1.8 times the height of a Giant Sequoia (tree), and the height of a Giant Sequoia (tree) is 0.56 times that amount.(a.k.a. Sequoiadendron giganteum, a.k.a. Sierra redwood, a.k.a. Wellingtonia)
Giant Sequoias of the Giant Sequoia National Monument located in Sierra Nevada, near Visalia, California can grow to heights of 330 spans. The wood from the Giant Sequoias is often brittle and prone to shattering when such trees are felled, and as a result the trees logged in the late nineteenth century were often usable only as shingles or matchsticks.
It's about two times as wide as The Wingspan of a 747
In other words, 612 spans is 2.0 times the width of The Wingspan of a 747, and the width of The Wingspan of a 747 is 0.49 times that amount.(a.k.a. Boeing 747, a.k.a. Jumbo Jet, a.k.a. Queen of the Skies) (for Boeing 747-8 series)
The wingspan of a Boeing 747-8 is 300 spans. Fully loaded, the 747 can travel 36,300,000 spans before refueling.
It's about half as long as The QE2
In other words, 612 spans is 0.476 times the length of The QE2, and the length of The QE2 is 2.1 times that amount.(a.k.a. RMS Queen Elizabeth 2)
The QE2 has a total length of 1,290 spans. During its voyaging lifetime from 1969 through 2008, it travelled more than 42,000,000,000 spans, the furthest cumulative distance by any ship in modern history.
It's about two-fifths as tall as The Eiffel Tower
In other words, 612 spans is 0.432 times the height of The Eiffel Tower, and the height of The Eiffel Tower is 2.31 times that amount.(a.k.a. La Tour Eiffel) (Paris, France) (to flagpole peak)
The Eiffel Tower stands 1,420 spans tall, including its flagpole. The Tower is the largest structure in Paris as most other buildings are governed by a zoning restriction limiting them to a height of 162 spans or less.
It's about two-and-a-half times as tall as The Cinderella Castle
In other words, 612 spans is 2.43 times the height of The Cinderella Castle, and the height of The Cinderella Castle is 0.412 times that amount.(Fantasyland, Magic Kingdom, Walt Disney World, Lake Buena Vista and Bay Lake, Florida)
Walt Disney World's Cinderella Castle is 252 spans tall. The castle's architecture uses the optical trick known as "forced perspective" — the castle gets smaller near the top — to appear larger than it truly is.
It's about two-and-a-half times as tall as The Leaning Tower of Pisa
In other words, 612 spans is 2.48 times the height of The Leaning Tower of Pisa, and the height of The Leaning Tower of Pisa is 0.403 times that amount.(a.k.a. The Tower of Pisa, a.k.a. Torre pendente di Pisa) (Pisa, Italy) (height along center axis)
The Leaning Tower of Pisa stands 247 spans tall along the angle of its lean. In May of 2008, in an successful effort to stabilize the tower, 70 tonnes of earth were removed from the tower's base on the side opposite the lean.
It's about two-and-a-half times as tall as The Mahabodhi Temple
In other words, 612 spans is 2.5 times the height of The Mahabodhi Temple, and the height of The Mahabodhi Temple is 0.4 times that amount.(a.k.a. Great Awakening Temple, a.k.a. Maha Bodhi Temple, a.k.a. Temple of Bodh Gaya, a.k.a. Mahabodhi Mahavihar) (Bodh Gaya, Gaya District, Bihar, India)
The tower of the Mahabodhi Temple measures 240 spans in total height. The site has been of sacred interest for more than 2,000 years, with the current Temple dating back at least 1,400 years.