A mysterious castle built as a monument to lost love.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

Where manatees are the snowbird vacationers in these balmy Florida springs.

A small, forgotten prison cemetery marked only by a wrought-iron fence and eerie depressions left in the ground.

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

The all-but-forgotten cemetery is Eastern Loudon County's largest African-American burial ground.

A secret rendezvous spot where John S. Mosby and his Rangers would meet to divvy up their loot after raids.

This abandoned church languishing for decades is now one man's passion project and subject of paranormal investigators.

This "castle" is actually a limestone and quartz formation hidden along a trail.

A glimpse into the sacrifices of military members during World War II.

These trees are living witnesses to events that inspired poet Walt Whitman’s service during the American Civil War.

The most historic church in Fairfax County played a role in the creation of the American Red Cross.

A graveyard that dates back over 200 years stands near a busy shopping center.

This little brick tunnel built by Confederate forces was used to conduct surprise attacks on the railroad.

The grave of a champion Thoroughbred hides within the former presidential estate.

This historic, one-acre island is the only legal place to camp in the city of Richmond.

Burke’s oldest cemetery also houses the victim of the county's grisliest murder.

These massive concrete balls were used to mine gold in Virginia.

This twice-relocated "Usonian" home is among the smallest built by master architect Frank Lloyd Wright.

Standing for over 200 years, the abandoned home of a Revolutionary War hero and later a succession of prison superintendents.

This brick-lined pedestrian walkway was once a railway tunnel used during the Civil War.

This campus chapel is Robert E. Lee's final resting place and a topic of debate about the legacy of the Civil War.

A lone historical marker off the highway and scattered debris are all that remain of this Cold War-era missile site.