A centuries-old church stands as a testament to Boston's "father of architecture."

This sandstone gorge in New York State's Adirondack Mountains is home to waterfalls, flumes, and more.

Memorializing an American tragedy of massive proportions.

Steepest flood safety railway in the entire world.

A historic coal mine that doubles as a museum and tourist attraction.

The home of aviation trailblazers, in a remote corner of the big city.

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

Visit the monolithic tomb of America's most famous general.

Lie in a hammock where George Washington stood.

Famously misunderstood wonder of the ancient world

The vaguely man-shaped root that ate the body of the founder of Rhode Island.

While many places make the claim, the Library of Congress says this restaurant is the birthplace of the hamburger.

Go inside to really appreciate this 500-year-old technological masterpiece.

The world's oldest and largest museum of mass transit vehicles.

In upstate New York, gorgeous waterfalls and a watermill are slowly being reclaimed by nature.

A simple Colonial home with a past haunted by death and madness.

This symbolic piece of New Orleans architecture is also home to a few ghastly stories.

Elevated freight railway turned wildly successful urban park.

The National Railway Museum in York is the largest railway museum in the world, attracting almost 1 million visitors per year.

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

The final resting place of American icon Buffalo Bill, and a museum that aids in telling his tale.

An enormous pink granite batholith, long attributed with spiritual powers by the Tonkawa Indians.

Stone memorial that's said to predict the death of the pope and the site of the Cadaver Synod.