A model of a dinosaur that was named for Andrew Carnegie stands outside the museum that also bears his name.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

A six-ton, 12-foot-tall concrete prairie dog is touted as the largest in the world.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

The Iowa state contender for largest pan in the world oddly only comes in second or so.

The only road through the heart of Glacier National Park.

Compensation for the destruction of a historic shipyard.

In its day this historic fort held 100 cannons pointed in almost every direction to protect New York.

Once called Winthrop Park in 1889, home to a decidedly sexy tribute to the Monitor vs. Merrimac battle.

Blighted Irish field and the ruins of a 19th-century cottage on the edge of urban Manhattan.

One-time largest man-made structure in the world will be a park in 30 years.

This once-grand marvel of engineering is now 41 miles of scenic hiking trail.

Manhattan and the Bronx have been playing tug-of-war over this former island neighborhood for more than a century.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

A little lighthouse in New York City, surrounded by mysterious stories of insanity-driven construction.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

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

This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.

A WWI fighter plane and turn-of-the-century penny candy shop are among the unexpected features of this Financial District building.

This abandoned seaside fortress is now simply an imposing ruin being taken back by nature.

A former seaside jewel built for the everyman is now simply a neglected art deco fortress.

First a horse rendering plant, then a 19th century landfill, this beach is full of glass from thousands upon thousands of broken bottles.

Waterway populated with abandoned projects, including a submarine.

19th century cemetery hidden in Brooklyn's Prospect Park.