The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

The world's third-largest crystal sphere has sat in the Penn Museum since 1927 with the exception of one outlandish theft.

A daily replay of the experiment that proved the rotation of the Earth.

This elaborate towering structure was once famed for its revolutionary height.

This meticulously extracted nervous system allegedly came from a 19th-century custodian who donated her body to science.

The Midwestern United States' tribute to Michelangelo is a foam statue sprayed with gaudy gold paint.

This abandoned cemetery has a dark past of bodies buried over bodies.

One man’s hobby is another man’s world of metal wonders.

Lost subway station nestled beneath Toronto's busy commuter line.

A colorful square marks the heart of the city's LGBTQ community.

The world's first time capsule lies behind a welded steel door in Atlanta.

The largest cemetery in the American Southeast is a hidden gem near the heart of Atlanta.

One man's extraordinary topiary garden in a small South Carolina town.

On the Hudson resides one of the largest clocks in the world.

A bronze plaque at an intersection in Hoboken marks the place where the game of baseball first took shape.

Along a busy beachfront strip you may hear Frank Sinatra singing from one boardwalk home.

A simple plaque remembers an act of WWI terrorism that obliterated an island and forever scarred the Statue of Liberty.

Where the embers of the Big Bang were first detected.

The remains of an old sawmill, gristmill and the surrounding industry dating back to the 18th century.

A historic grist mill and active sluice on the Black River.

The final resting place of up to 6,000 Confederate soldiers, the largest mass grave in the Western Hemisphere.

The 606 is a decade in the making.

A science teacher's dream.

A haunting statue called "Eternal Silence" has quite the reputation among visitors with active imaginations.