10. Yosemite Valley
Yosemite Valley is a glacial valley in Yosemite National Park in the western Sierra Nevada mountains of California, carved out by the Merced River. The valley is about 13 km long and up to a mile deep, surrounded by high granite summits such as Half Dome and El Capitan, and densely forested with pines. A multitude of streams including Tenaya, Illilouette and Bridalveil Creeks join in the valley, and flow out of the mouth of the valley as the Merced River, which eventually flows to the Pacific Ocean.
Yosemite Falls is the highest measured waterfall in North America. Located in Yosemite National Park in the Sierra Nevada of California, it is a major attraction in the park, especially in late spring when the water flow is at its peak. The total height is 739 m from the top of the upper falls to the base of the lower falls. In years of little snow, the falls may actually cease flowing altogether in late summer or fall.
The American Falls is one of three waterfalls that together are known as Niagara Falls on the Niagara River along the Canada–U.S. border. Unlike the much larger Horseshoe Falls, of which two-thirds of the falls is located in Ontario, Canada, and one-third in New York State, United States, the American Falls is completely within the U.S. state of New York. The falls receive approximately 10% of the flow from Niagara River, with most of the rest going over Horseshoe Falls, from which it is separated by Goat Island.
The Washington Monument is an obelisk on the National Mall in Washington, D.C., built to commemorate the first American president, General George Washington. The monument, made of marble, granite, and bluestone gneiss, is both the world tallest stone structure and the world tallest obelisk, standing 169.294 meters.
Fort Jefferson is a massive but unfinished coastal fortress. It is the largest masonry structure in the Americas, and is composed of over 16 million bricks. The Dry Tortugas are part of Monroe County, Florida, United States. The fort is located on Garden Key in the lower Florida Keys within the Dry Tortugas National Park, about 110 km west of the island of Key West.
5. Lake Tahoe
Lake Tahoe is a large freshwater lake in the Sierra Nevada of the United States. At a surface elevation of 1897 m, it is located along the border between California and Nevada, west of Carson City. Lake Tahoe is the largest alpine lake in North America. Its depth is 501 m, making it the second-deepest in the United State. The lake was formed about 2 million years ago and is a part of the Lake Tahoe Basin with the modern lake being shaped during the ice ages.
4. Half Dome
Half Dome is a granite dome in Yosemite National Park, located in northeastern Mariposa County, California, at the eastern end of Yosemite Valley - possibly the most familiar rock formation of Yosemite. The granite crest rises more than 1,444 m above the valley floor. Half Dome is nearly as whole as it ever was. The impression from the valley floor that this is a round dome which has lost its northwest half is an illusion. From Washburn Point, Half Dome can be seen as a thin ridge of rock oriented northeast-southwest, with its southeast side almost as steep as its northwest side except for the very top.
Mount McKinley, or Denali (Koyukon Athabaskan for The High One) is the highest mountain peak in the United States and in North America, with a summit elevation of 6194 m above sea level. Measured base-to-peak, it is the tallest mountain on land. Measured by topographic prominence, it is the third most prominent peak after Mount Everest and Aconcagua. Located in the Alaska Range in the U.S. state of Alaska, it is the centerpiece of Denali National Park and Preserve.
Honolulu is the capital and the most populous city of the U.S. state of Hawaii. Honolulu is the southernmost major U.S. city. Although the name Honolulu refers to the urban area on the southeastern shore of the island of Oahu, the city and county are consolidated as Honolulu County which covers the entire island.
1. Mammoth Cave
Mammoth Cave National Park is a U.S. National Park in central Kentucky, encompassing portions of Mammoth Cave, the longest cave system known in the world. The official name of the system is the Mammoth-Flint Ridge Cave System for the ridge under which the cave has formed. The park was established as a national park on July 1, 1941. It became a World Heritage Site on October 27, 1981, and an international Biosphere Reserve on September 26, 1990.
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The rocks vary in color from primarily red to yellow; some of the rocks reach up to 200 m in height.
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