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How long is 66.5 miles?

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It's about as long as The English Channel.
(average width between Isle of Ushant and The Walde Lighthouse) (La Manche, Ärmelkanal, Mor Breizh, Mor Bretannek) (a.k.a. The Channel)
The English Channel measures between 66.5 miles, narrowing as it flows northeast. The world speed record for a Channel crossing by swimmer was set by Australian Trent Grimsey in 2012, with a time of 6 hours, 55 minutes.
It's about nine-tenths as long as The 405.
In other words, 66.5 miles is 0.91832 times the length of The 405, and the length of The 405 is 1.0889 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 72.415 miles. 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 nine-tenths as long as Hadrian's Wall.
In other words, 66.5 miles is 0.89 times the length of Hadrian's Wall, and the length of Hadrian's Wall is 1.1 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 75 miles (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 one-and-one-fifth times as long as The Panama Canal.
In other words, the length of The Panama Canal is 0.83 times 66.5 miles.
(Canal de Panamá) (Panama)
Connecting the Atlantic and Pacific Oceans across the Isthmus of Panama, the Canal measures 55 miles in length. Ships passing through the Canal are raised (and then lowered) 0.016 miles above sea level through the lock-and-dam system.
It's about four times as tall as Olympus Mons.
In other words, the height of Olympus Mons is 0.25 times 66.5 miles.
(a.k.a. Mount Olympus) (Mars)
The tallest mountain in the solar system, Olympus Mons rises to approximately 17 miles. The mountain has been known to astronomers since the nineteenth century because it is tall enough to rise above Mars' frequent dust storms.
It's about one-fourth as long as The Grand Canyon.
In other words, 66.5 miles is 0.24 times the length of The Grand Canyon, and the length of The Grand Canyon is 4.17 times that amount.
(a.k.a. Gran Cañón) (Arizona) (Colorado River miles measure)
The Grand Canyon has a total length of 277 miles 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 0.684 miles above the floor of Granite Gorge.
It's about nine-and-a-half times as tall as Maxwell Montes.
In other words, the height of Maxwell Montes is 0.1 times 66.5 miles.
(Ishtar Terra, Venus)
Maxwell Montes rises to a total height of 6.8 miles. Since Venus does not seem to have the kind of tectonic activity which gives rise to mountains on Earth, the origin of the Venusian mountain remains the subject of some dispute.