The remains of a 19th century spring, and the site of an infamous unsolved murder.

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

The boulder on which Alexander Hamilton laid his head after a deadly duel can still be visited on the New Jersey coast.

This huge work of functional public art replaced a landfill in New Jersey's Meadowlands.

The drawbridge used in the filming of the movie 'Annie' has been in the open position as it was in the movie for decades.

This huge, disused viaduct is now a crumbling concrete underworld of covered in years of graffiti.

The train collection of an eccentric New England seafood mogul is now a National Historical Site.

A planned settlement in Pennsylvania once housed the aristocratic refugees of the French Revolution.

The wooden octagon in which Huckleberry Finn and A Connecticut Yankee were born can still be visited in upstate New York.

The little-known final resting place of one of America's greatest writers.

Golden plates containing what would become the Book of Mormon were believed to be buried on this New York hillside.

Soaring over the Niagara Whirlpool since 1916.

This 1836 church, constructed by formerly enslaved people, honors a leader in Afrocentric music.

A tunnel that brings more than a century of history to life from the deepest parts of the Niagara Gorge.

Niagara Falls holds a special place in Nikola Tesla's history, so they put a statue on it.

The only boathouse Frank Lloyd Wright ever designed was also the only unbuilt structure in his famous Wasmuth Portfolio, until 2007.

A monument to a Polish general who fought the American Revolution and became the "Father of the American Cavalry."

The absurd creation is a compulsory destination for selfies in Buffalo.

This vessel is believed to be the oldest operating fireboat in the world.

A monument honoring those who died in the Great Famine of Ireland.

A 19th-century architectural wonder designed by the "father of the skyscraper."

The seat of Buffalo government is a gorgeous Art Deco palace.

An interesting look into 18th-century American history.

Possibly the smallest church in the world floats in the middle of a pond.