Mug House, built around 1,100 - 1,200 AD, was so named from the discovery of three pottery mugs tied together with a rope and hanging in one of the rooms of this cliff dwelling in Mesa Verde National Park.

"Rolling hills, deep river valleys, and the world's longest known cave system. Mammoth Cave National Park is home to thousands of years of human history and a rich diversity of plant and animal life, earning it the title of UNESCO World Heritage Site and International Biosphere Reserve."

Cave tours are a unique and immersive way to understand and safely explore Mammoth Cave. You can go to the website to learn more about tours, tickets, and times.

"Fort Jefferson, the largest all-masonry fort in the United States, was built between 1846 and 1875 to protect the nation's gateway to the Gulf of Mexico. Supply and subsidence problems and the Civil War delayed construction. The fort was never completed because of fears that additional bricks and cannon would cause further settling and place more stress on the structure and the cistern system. Distinguishing features include decorative brickwork and 2,000 arches.

"For centuries, the Oneida Carrying Place, a six mile portage connecting the Mohawk River and Wood Creek, served as a vital link for those traveling by water from the ocean to the Great Lakes. When Europeans arrived, nations fought for control of the carry, the homelands of the Six Nations Confederacy, and the rich resources of North America. In this struggle, Fort Stanwix would play a vital role."

"The battle at Fort Necessity in the summer of 1754 was the opening action of the French and Indian War. This war was a clash of British, French and American Indian cultures. It ended with the removal of French power from North America. The stage was set for the American Revolution."

"Originally established as a private fur trading fort in 1834, Fort Laramie evolved into the largest and best known military post on the Northern Plains before its abandonment in 1890. This 'grand old post' witnessed the entire sweeping saga of America’s western expansion and Indian resistance to encroachment on their territories."

"Throughout its history, the story of Fort Matanzas has been closely intertwined with that of the city of St. Augustine and the Castillo de San Marcos. This Spanish outpost fort was built in 1740-1742 to guard the Matanzas Inlet and to warn St. Augustine of British or other enemies approaching from the south. Fort Matanzas now serves as a reminder of the early Spanish empire in the New World.

According to the National Park Service, "In the northwest corner of Fort Vancouver's protective palisade wall, a three-story tower called a bastion or blockhouse rose above the surrounding plain. From the top, Hudson's Bay Company (HBC) employees could keep watch over the Columbia River valley and its gently rolling hills. The bastion was a common feature of HBC posts throughout North America.

"Only from an aerial view can the entire breadth of Fort Monroe [National Monument] be taken in all at once. Consisting of many significant examples of historic, cultural, and natural resources the almost 600 acres of Fort Monroe, VA has been a National Historic Landmark since 1960."

According to the National Park Service, "Fort Pulaski National Monument is located in Georgia and was added to the Network in 2019. Fort Pulaski National Monument was captured by US forces in the Spring of 1862, an event which served as the impetus for General David Hunter to issue a series of orders formally emancipating the enslaved people of coastal Georgia and South Carolina. The fort was later garrisoned by United States Colored Troops in 1866."