This one-room doctor's office has been moved twice, and now lives on as a museum.

The site of one of the deadliest skirmishes during the Battle of Fredricksburg.

Memorials are nearly all that remains of this Arkansas prison camp, where thousands of Japanese Americans were forcibly relocated during World War II.

The ruins of a 17th-century lodge on a grand estate are being slowly restored to their former glory.

An underground river pushes more than 200 million gallons out of this Missouri spring every day.

The remains of a massive blast furnace in what was once one of the country's largest iron-producing regions.

At the most northwestern point of the contiguous United States lies a trail leading through an ancient forest to stunning cliff-side vistas and massive oceanside caves.

A Kansas nature preserve protecting the plants and animals that once stretched across central North America.

The Grand Canyon’s original airport, which once welcomed pilots like Amelia Earhart and Charles Lindbergh, lies abandoned.

People of the Plum Bayou culture built these enormous mounds over 1,000 years ago.

The remains of Abó, Gran Quivera, and Qurai are monuments to the long, complicated history of the Indigenous people of the Southwest.

Home to some of Indiana's last bison herds.

In the waters outside Helsinki, a tiny island once used as a military outpost now welcomes visitors.

The crumbling remains of a gold mine that was operational in the 1930s.

A chimney and a plaque are all that remains of a logging camp that once cleared out a large swath of Minnesota's old-growth forest.

This Philippine island is dotted with (fake) Grecian ruins.

The first blast furnace in the United States that used coal and coke fuel instead of charcoal to make pig iron.

The site of the largest mass execution in Rhode Island history, haunted by the ghosts of hanged pirates.

One of the largest pieces of scientific equipment ever carried on a NASA space shuttle sits in a Chicago alley.

Home of the future Emperors of Russia.

Those belting out show tunes might not realize this piano bar marks the site where Thomas Paine died in 1809.

A gothic-styled structure that has been the location for several movies.

This Masonic lodge was the first major private building to be constructed in Washington, D.C. after the Civil War.

A rare memento of a lost Indigenous group.