Rome's elevation is 66 feet above sea level.The Pantheon was built at the lowest elevation (no number available).
Leadville, Colorado, to name one, is 10,152 ft. above sea level. Most of Quito, Ecuador is above 10,000 feet. The airport there (9228 feet) is in the middle of the valley, and the entire city surrounds it.
10000 feet
It is at an elevation of 10000 feet, The highest golf course
Colorado has over half of its land area located more than 10,000 feet above sea level. This makes it a state with a high elevation range, with numerous mountains, including the Rocky Mountains.
Some examples of US cities with a population of 10,000 or less include Alpine, Arizona; Crystal, North Dakota; and Westhope, North Dakota.
Try Google or any of the major search engines.
4' should get you up to about 7000' in elevation 5' should get youto about 10000' in elevation and 6' should cover the rest
10000 10000 10000 10000 10000
20000-10000 = 10000
10,000,000,000,000,000
89/10000= 0.0089 * 10000/10000= 89/10000