The vast, legendary catacombs hold secrets much stranger than stacked bones.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

Immortalized in bronze, this frazzled student will be glued to his screen for centuries.

An architectural oddity hides in plain sight on this iconic London bridge.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

Hunt for buried treasure in Nova Scotia.

This monument to a veteran of the Mexican-American War is one of only two in Manhattan that serve as an actual mausoleum.

A Victorian cemetery in the heart of Brooklyn remains a popular mecca of morbid curiosity.

This handsome house on a hill was home to one of the 18th century's most famous American architects

How did a historical Black burial ground become a Staten Island strip mall?

Failed state-supported institution meant to rehabilitate students with intellectual disabilities.

An 1814 castle that hosts an exhibit of "explorabilia".

This Pennsylvania structure, the oldest building in Gettysburg, was once a stop on the Underground Railroad.

Dedicated to one of the most successful boxers to compete in the heavyweight division.

Designed by the company that provided water to the entire community.

A eight-foot-tall statue resides in the heart of Pennsylvania anthracite coal country.

The only geyser in the state of Pennsylvania is caused by pressure from an abandoned coal mine outside of the ghost town Centralia.

Take a ride inside a former coal mine in Ashland, Pennsylvania.

An underground blaze turned this village into a ghost town.

These hooded graves are the only of their kind in the United States.

Metal monsters made from repurposed materials lurk alongside this Pennsylvania road.

A train station that was abandoned by the coal industry and converted into a cocktail bar. Now it’s home to the local visitor bureau.

Featuring the largest CinemaScope screen in Pennsylvania, this drive-in has entertained moviegoers for more than half a century.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.