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How long is 13 feet?

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It's about one-thirty-thousandth as long as The 405
In other words, 13 feet is 0.000034 times the length of The 405, and the length of The 405 is 29,412 times that amount.
(a.k.a. I-405, Interstate 405, San DIego Freeway) (Southern California)
Running from Irvine to San Fernando, The 405 runs a total of 382,350 feet. The 405 is the most heavily-trafficed freeway in the United States, with an average speed as low as 8 kph during rush hours.
It's about one-thirty-thousandth as long as Hadrian's Wall
In other words, 13 feet is 0.000033 times the length of Hadrian's Wall, and the length of Hadrian's Wall is 30,000 times that amount.
(a.k.a. Roman Wall, a.k.a. The Wall, a.k.a. Vallo di Adriano, a.k.a. Vallum Aelium, a.k.a. Severus' Wall) (from North Tyneside, Tyne and Wear, England, United Kingdom to Cumbria, North West England, United Kingdom)
Hadrian's Wall, which crossed England form the North Sea to the Irish Sea during the time of Roman rule, measures 390,000 feet (about 79 Roman miles). Roman soldiers — at one time up to 10,000 of them — only occupied Great Britain for about 246 years after the wall was built, after which time the local Brits began to take residence the wall's garrisons.
It's about 40,000 times as wide as a Strand of Hair
In other words, 13 feet is 40,000 times the width of a Strand of Hair, and the width of a Strand of Hair is 0.000025 times that amount.
(average)
A strand of human hair averages 99 µm (micrometers), with blond hair being the finest and black hair the thickest. On a healthy scalp, each strand of hair will last up to 6 years.
It's about 40,000 times as tall as a sheet of Paper
In other words, 13 feet is 40,000 times the height of a sheet of Paper, and the height of a sheet of Paper is 0.000030 times that amount.
(for US Letter, a.k.a. ANSI A; 215.9mm by 279.4mm (8.5 in x 11 in); 20lb)
A single sheet of 20 lb, 8.5 inch x 11 inch paper is just 0.0003 feet thick. This style of paper weighs a mere 5 g per sheet.
It's about one-one-hundred-thousandth as long as The Grand Canyon
In other words, 13 feet is 0.00000888 times the length of The Grand Canyon, and the length of The Grand Canyon is 113,000 times that amount.
(a.k.a. Gran Cañón) (Arizona) (Colorado River miles measure)
The Grand Canyon has a total length of 1,460,000 feet along the course of the Colorado River at its bottom. Having opened in early 2007, the Grand Canyon Skywalk allows tourists to stand on a horseshoe-shaped glass walkway 3,610 feet above the floor of Granite Gorge.
It's about one-three-hundred-fifty-thousandth as long as The Rhine
In other words, 13 feet is 0.0000030 times the length of The Rhine, and the length of The Rhine is 333,000 times that amount.
(a.k.a. Rhein, a.k.a. Rijn, a.k.a. Rhin, a.k.a. Rain, a.k.a. Reno, a.k.a. Rhenus, a.k.a. Ryn) (from near Reichenau, Switzerland through Hoek van Holland, Rotterdam, Netherlands)
The Rhine river runs 4,330,000 feet in total length. The World War II Battle of Arnhem, as memorialized in the 1974 book and 1977 movie A Bridge Too Far, was the first of several attempts to capture key bridges across the Rhine, beginning with the Arnhem Bridge in the Netherlands.
It's about 550,000 times as long as a Red Blood Cell
In other words, 13 feet is 530,000 times the length of a Red Blood Cell, and the length of a Red Blood Cell is 0.0000019 times that amount.
(a.k.a. RBCs, a.k.a. haematids, a.k.a. erythrocyte, a.k.a. erythroid cells, a.k.a. red blood corpuscles)
An average Red Blood Cell measures 7.5 µm (micrometers) in diameter. An average human has 20 - 30 trillion red blood cells in their body and each cell completes a circulatory lap in about 20 seconds.