It's about two-fifths as tall as a Giant Sequoia (tree)
In other words, 100 feet is 0.4 times the height of a Giant Sequoia (tree), and the height of a Giant Sequoia (tree) is 2.5 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 250 feet. 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 three times as tall as a Telephone Pole
In other words, 100 feet is 2.8 times the height of a Telephone Pole, and the height of a Telephone Pole is 0.36 times that amount.(a.k.a. Utility Pole, a.k.a Power Pole, a.k.a. Telegraph Pole, a.k.a. Telegraph Post, a.k.a. Hydro Pole) (exposed height; per Florida Public Service Commission average)
A standard telephone pole is 36 feet tall. Despite alternatives, most telephone poles in the US are made of wood — most commonly pine — and have a lifespan of 25 to 50 years, depending on climate and preservatives applied.
It's about one-third as tall as The Statue of Liberty
In other words, 100 feet is 0.3278 times the height of The Statue of Liberty, and the height of The Statue of Liberty is 3.05 times that amount.(a.k.a. "Liberty Enlightening the World," a.k.a. La Liberté Éclairant le Monde) (Liberty Island, New York City, New York) (pedestal base to torch peak)
The Statue of Liberty reaches 305.10 feet including the pedestal. The statue was designed using an optical trick known as "forced perspective" to make the statue appear proportionally correct when viewed from its base and is, in actuality, disproportionately large at the top.
It's about one-third as tall as Big Ben
In other words, 100 feet is 0.32 times the height of Big Ben, and the height of Big Ben is 3.1 times that amount.(officially the clock tower of Palace of Westminster, a.k.a. Houses of Parliament) (London, England)
The clock tower of the Palace of Westminster, which houses the bell known as "Big Ben," rises 310 feet. The tower has no elevator, and is therefore only accessible by climbing 334 steps to the top.
It's about three-tenths as long as a Football (Soccer) Pitch
In other words, 100 feet is 0.29 times the length of a Football (Soccer) Pitch, and the length of a Football (Soccer) Pitch is 3.45 times that amount.(a.k.a. Football Field, a.k.a. Soccer Field) (field length, a.k.a. touchline distance)
According to the Laws of the Game, a football pitch should measure between 344 feet (when the Laws were originally, they used imperial measurements of 345 feet, and later converted to the metric units used today). The goal markess were defined as part of the pitch by the original rules of the game in the late 16th century, but it was not until the mid 19th century that the crossbar and the net were added
It's about three-tenths as long as a Football field
In other words, 100 feet is 0.277778 times the length of a Football field, and the length of a Football field is 3.6 times that amount.(American) (total distance; per NFL regulation)
According to NFL specifications, an American football field should measure 360 feet from end to end. Because each team's goalpost is located at the far end of the scoring area (end zone), a ball on a scoring play may need to travel as many as 30 feet farther when kicked into the scoring area than when run (rushed) or passed into it.
It's about three-and-a-half times as long as a London bus
In other words, 100 feet is 3.64 times the length of a London bus, and the length of a London bus is 0.275 times that amount.(Routemaster Double-Decker, RM standard specification)
The Routemaster Double-Decker buses, well-known as icons of London, measure 27.50 feet in length. The buses were said to be well-designed for travel in the London traffic, as they offered an open door for riders to board and exit even while the bus was moving at low speeds, and a full-time conductor to collect fares.