This haunting monument honors the victims of 9/11.

The world's largest collection of historic U.S. military naval vessels.

This hotel was the site of major events in sports and radio history. It was also used as a detention center during World War II.

A black sand beach where glacial fragments wash ashore and look like sparkling diamonds.

Constructed for defense, this fort oversaw the dress rehearsal for one of the largest invasions in history.

A gift to the children of Boston, this bronze bear represents playfulness, a spirit of love, and the warmth of big hugs.

A stone marker commemorating the first time sound was transmitted over wires.

A series of stained glass artworks that depict images of the hit TV show.

This rusted car found in Petrified Forest National Park's Route 66 exhibit may be the most photographed abandoned car in the country.

A journey through every aspect of the human body.

This 1930s-era Route 66 Tulsa landmark was moved, restored, and filled with neon.

This museum on a college campus pays tribute to the Arctic and to two explorer alumni.

This statue intended for children to enjoy became a minor political spat.

Hundreds of graffiti artists have decorated this flood-wall on the west bank of the Mississippi River.

Man-made geyser that rises to the exact height of the Gateway Arch.

The world's only surviving heavy cruiser has a haunting history.

One of the indelible moments of the American Revolution took place at this location.

This area was once known for being a lawless haven for rough-and-tumble sailors, earning the maritime-themed nickname "the black sea."

An easy-to-miss garden in Boston's North End honors the mother of JFK and others who lost children in WWII.

Dedicated to nine marines from Massachusetts who perished during the Beirut bombings.

A dedication plaque on this Boston tunnel is a microcosm of a massive, controversy-laden construction project.

This silver-mining camp has been active intermittently from the 1860s to the present.

An artifact taken from one of America's shortest wars.

This unique art installation used boiler tubes from a decommissioned power plant to resemble Antelope Canyon.