This anonymous businessman sculpted in bronze became an enduring memorial after 9/11, and had been mistaken by rescue workers for a survivor in the rubble.

A Manhattan tombstone honors a popular 19th-century heroine, now long forgotten.

Unrepaired walls from a 1920 anarchist bomb attack.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

Wooden pavers represent a 17th-century barrier that gave Wall Street its name.

This curved Manhattan building was built to house the opulence of John D. Rockefeller's oil empire.

Currently housing a corporate bank branch this building at the southern tip of Manhattan was once the gateway to luxury vacationing.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

The home of the first American-born saint is one of the only curved buildings in New York.

In West Virginia, you can walk across the longest single-arch bridge in the Western Hemisphere.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

Built hundreds of years ago this downtown iron barrier once protected a much despised king.

Twice a day one of these tragic bronze mariners drowns with the tide to remember all those the sea has taken.

The Kirkland Monument remembers a selfless Civil War hero who braved the battlefield to give water to his dying enemies.

A home that witnessed Civil War combat on the Sunken Road has the battle scars to prove it.

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

The graveyard holding the remains of George Washington's slaves was forgotten for nearly 200 years.

This fort down the Potomac from Washington, D.C. was once the only defensive fort protecting the capital.

The ruins of an 18th-century mansion that was once named "Mistake" by the man who had it built.

A tiny monument to the unsuccessful attempt by Thomas Jefferson to place the prime meridian in Washington.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

The "lovely red Vega" of the legendary record-settling pilot.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.