How long is 50 meters?
It's about as tall as The Arc de Triomphe

The height of The Arc de Triomphe is about 49 meters.
(Paris, France)
It's about as tall as Nelson's Column

The height of Nelson's Column is about 51.640 meters.
(London, England, United Kingdom) (from pedestal first step to tip of statue's hat)
It's about one-and-one-tenth times as tall as The Chicago Water Tower

The height of The Chicago Water Tower is about 46.90 meters.
(Chicago, Illinois)
It's about nine-tenths as tall as The Mahabodhi Temple

The height of The Mahabodhi Temple is about 55 meters.
(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)
It's about nine-tenths as tall as The Leaning Tower of Pisa

The height of The Leaning Tower of Pisa is about 56.40 meters.
(a.k.a. The Tower of Pisa, a.k.a. Torre pendente di Pisa) (Pisa, Italy) (height along center axis)
It's about nine-tenths as tall as The Cinderella Castle

The height of The Cinderella Castle is about 57.60 meters.
(Fantasyland, Magic Kingdom, Walt Disney World, Lake Buena Vista and Bay Lake, Florida)
It's about one-and-one-fifth times as long as Ha'Penny Bridge

The length of Ha'Penny Bridge is about 42.90 meters.
(a.k.a. Droichead na Leathphingine, a.k.a. Liffey Bridge, a.k.a. Droichead na Life, f.k.a. Wellington Bridge) (Quay of Bachelors Walk, Temple Bar Neighborhood, Dublin, Ireland)
It's about three-fourths as wide as The Wingspan of a 747
The width of The Wingspan of a 747 is about 68.50 meters.
(a.k.a. Boeing 747, a.k.a. Jumbo Jet, a.k.a. Queen of the Skies) (for Boeing 747-8 series)
It's about two-thirds as tall as a Giant Sequoia (tree)
The height of a Giant Sequoia (tree) is about 76 meters.
(a.k.a. Sequoiadendron giganteum, a.k.a. Sierra redwood, a.k.a. Wellingtonia)
It's about one-and-four-fifths times as long as Baseball base distances
The length of Baseball base distances is about 27.4320 meters.
(MLB Official Baseball Rules specification)
It's about half as tall as The Statue of Liberty

The height of The Statue of Liberty is about 92.990 meters.
(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)
It's about one-and-nine-tenths times as tall as De Gooyer

The height of De Gooyer is about 27 meters.
(a.k.a. De Funenmolen, a.k.a. The Mill on the Funen) (near Oostelijk Havengebied, Amsterdam, Netherlands) (total structure height)
It's about half as tall as Big Ben

The height of Big Ben is about 96 meters.
(officially the clock tower of Palace of Westminster, a.k.a. Houses of Parliament) (London, England)
It's about half as long as a Football (Soccer) Pitch
The length of a Football (Soccer) Pitch is about 105 meters.
(a.k.a. Football Field, a.k.a. Soccer Field) (field length, a.k.a. touchline distance)
It's about half as long as a Football field
The length of a Football field is about 109.7280 meters.
(American) (total distance; per NFL regulation)