The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.

An oft-overlooked, magically musical monolith that stands majestically between Arlington Cemetery and the Iwo Jima Memorial.

This landmark cemetery in Boston was created more than 300 years ago.

An aptly-named street near the birthplace of the modern LGBT rights movement.

American revolutionaries and British soldiers alike are buried here in the fourth-ever cemetery in Boston.

The massive machine creates cracking displays of indoor lightning.

This cathedral's stained-glass patchwork of psychedelic colors and shapes was put in place long before the swinging 60s.

Over the last century, this elegant columned facade has been home to the headquarters of a bank, several nightclubs, and a restaurant.

This sprawling 18th-century cemetery features unique and beautiful gravestones, including one shaped like a tree.

The remains of a community that was forced to move for a dam that never materialized still rot in this Pennsylvania park.

Inspiring Herman Melville and Henry David Thoreau, Mount Greylock in western Massachusetts is the highest point in the state at 3,491 feet above sea level.

The railroad tunnel nicknamed the "Bloody Pit" for taking the lives of hundreds during its construction.

A monument to the Mohawk people stands along an old Native American trade route.

This abandoned neighborhood is now a park filled with beautiful trees, wildflowers, and hints of its past.

Resonating tubes make music from highway overpass.

More than 200 unconventional musical instruments that anyone can play.

You can get anything you want at the former site of the restaurant immortalized by Arlo Guthrie.

The mansion home of author Edith Wharton.

A small chapel celebrating the spiritual bond between dogs and humans.

A 150-square-foot masterpiece of American landscape art is the crown jewel of this library and art gallery in Vermont.

Tour the world's largest deep-hole dimension granite quarry, where you can view the plant where gravestones are made and roll a ball down the outdoor granite bowling alley.

This stone complex marks the urban center of a lost civilization.

Public opinion is still divided on this enormous sculpture in front of Baltimore's Penn Station.

The lesser-known Alice sculpture of Central Park dedicated to the “godmother of American children.”