The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

Once decrepit and slated for demolition, now one of the longest pedestrian bridges in the world.

This shale formation along the Appalachian Trail once inspired the third president of the United States.

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.

A massive Montreal stadium that has seen nothing but trouble since its inception.

Bison, America's national mammal, are staging a slow comeback in Ohio's prairie parkland.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

Proto-CIA agents trained with grenades in the sand traps and fired machine guns from the fairways.

An enormous roadside pan tells the story of a battle for pie glory.

The world-record holder for the longest bridge stretching continuously over water.

In the 19th century, this was the center of Boston's Black community.

This headstone marks the grave of an 11-year-old boy killed during clashes in the streets over the boycotting of British goods.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

Dedicated to one of the darkest moments in Irish history.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

Once the most flame resistant building in the country, the South Carolina Historical Society building was almost burnt down in a fire.

A crumbling mountain resort that looks like it was abandoned in an instant.

A painfully obvious spy house sits right across the street from the Russian Embassy.

Traveling this mountain pass reveals quaint stone buildings, stunning Irish scenery, and a bridge said to grant wishes.

What was once the largest NFL stadium.

A towering bronze statue memorializes the founding father of postwar American conservatism.