The site of the daring river crossing that changed the course of the American Revolution.

The largest collection of Frazetta originals in the world.

This monument marks the beginning journey of a wounded soldier's leg that ended up almost two states away.

This monument is dedicated to Balto, the heroic Alaskan sled dog.

The 80-foot tire that looms over Michigan's I-94 was once a Ferris wheel in the New York World Fair.

This Rhode Island mansion was a stand-in for the exteriors of Collinwood in the original "Dark Shadows" series.

A mountain pass used by Prohibition-era bootleggers to facilitate traffic into and out of Canada from Vermont.

Experience the pivotal Civil War battle at this interactive museum.

This Pennsylvania structure, the oldest building in Gettysburg, was once a stop on the Underground Railroad.

See how aloe goes from field to store and discover the history of aloe cultivation in the Caribbean.

Long buried under the 20th-century landscape, this lift lock of the Alexandria Canal is the lone remnant of an ambitious early American transportation project.

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

Andy Griffith's hometown has made itself up to look like the fictional town of Mayberry.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

Taste the white whiskey that the United States' first president once distilled and enjoyed.

The only place for a truly presidential dram.

A small cave with a larger-than-life legend.

America's post-nuclear-attack chambers of Congress.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

The story behind the mysterious symbol painted in front of the historic university's famous Rotunda.

This monument is dedicated to those lost on June 6, 1944, in the town with that day’s highest per-capita casualty rate.

This Hindu temple in suburban New Jersey is the largest in the United States and one of the largest in the world.

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

This shrine to McDonalds' most iconic sandwich holds a 14-foot tall burger.