Independence Hall was designed by Andrew Hamilton and completed in 1753 to house the colonial assembly of the Province of Pennsylvania. It was renovated several times afterwards. The original wooden steeple used to house the Liberty Bell. The Hall was the site of the Second Continental Congress, during which the Declaration of Independence was signed in 1776. Following the American Revolution, the building held the Constitutional Convention that debated and signed the United States Constitution in 1787. Both documents have served as inspirations for lawmakers and government charters throughout the world. Have you ever visited Independence Hall?

Redwood national and state parks comprise one national and three state parks located along the coast of northern California. They are home to the largest contiguous forest of coastal redwood trees, which are the tallest tree species on Earth. The parks also contain areas of pristine coastline which is home to sea lion, bald eagle, and California brown pelican. Before this survey, were you familiar with the Redwood National Park?

Mammoth Cave is the longest known cave system in the world, with 426 mi (686 km) of mapped passageways. The cave system is home to more than 130 cave-dwelling species. The cave system and the surrounding area exhibit numerous examples of karst topography, with sinkholes, underground rivers, speleothem, and large chambers. The system also has a great variety of sulfate minerals. Have you ever heard of or visited Mammoth Cave National Park in Kentucky?

Olympic National Park comprises diverse habitats, including the largest protected area of temperate rainforest in the region, long stretches of undeveloped Pacific coastline, alpine meadows, and mountain peaks covered with glaciers. The rivers are important habitats for several anadromous fish species. Due to relative isolation, the area is home to several endemic species or subspecies. Some of the important species include the northern spotted owl, marbled murrelet, and bull trout. If you haven't already, would you like to visit the Olympic rainforest in the state of Washington?