A monument celebrating the idea of reaching inaccessible places.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

One of the oldest, tallest, and most haunted lighthouses in America.

A historic house in St. Louis was plagued by a series of suicides committed by family members involved in a successful brewery.

This former tuberculosis research hospital endeavored to cure the dreaded disease with fresh air and positive attitudes.

This covered bridge was used by both Union and Confederate troops during the Battle of Gettysburg in 1863.

Home of the only civilian casualty at the Battle of Gettysburg.

One of the best places to see wild Colonial Spanish Mustangs in the United States.

A dilapidated Victorian mansion sits in the middle of a Virginia golf course.

An alternate history park where the Union Army loses the war... to dinosaurs.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

This mobile theater show highlights the story of Hershey through fun facts, unique stories, and plenty of candy samples.

Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

A railroad tunnel that, upon its completion, was considered one of the engineering marvels of the modern world.

This historic mansion was built as a symbol of love between a husband and wife.

A former mental hospital founded in the 1930s by a eugenicist who advocated for the forced sterilization of patients.

Outdoor exhibits explore the contributions of European, African, and indigenous peoples to American frontier culture.

Forget Hollywood, one of the biggest stars in the world can be found in Roanoke, Virginia.

Paranormal investigators claim this abandoned asylum is the most haunted spot in the eastern U.S.

This tower was once used to create ammunition for early settlers.

The U.S. Supreme Court's secret Cold War relocation facility in the mountains of North Carolina.

Classy up your Big Mac with bow-tied servers and chandeliers at the world's fanciest McDonald's.

One of Savannah's oldest and most haunted cemeteries, featuring graves desecrated by Sherman's Union Army.