Once America's longest-manned military fort, now an abandoned hulk.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

This ancient art form was used to capture the lives and struggles of the Haywood Street ministry.

Every week, a festive public jam session breaks out in downtown Asheville.

The U.S. Supreme Court's secret Cold War relocation facility in the mountains of North Carolina.

An early life spent in this "Old Kentucky Home" inspired the writings of North Carolina's most famous novelist.

Follow the original medieval paths that wind through this intriguing section of the city.

The graffiti-covered ruins of an abandoned trading post in the middle of the Navajo Nation.

The remnants of a creative early method of wildfire prevention.

A monument to the one-armed geologist who led the first documented expeditions through the Grand Canyon.

After a short-lived attempt to bring America in line with the rest of the world, this road was left in metric.

The first permanent memorial to a unique secret weapon of World War II.

Hidden inside this Arizona fast food franchise is an in-depth exhibit on the famed WWII counterintelligence program.

Ancestral Puebloan ruins, natural arches, and box canyons abound in this seldom-visited corner of Monument Valley Navajo Tribal Park.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

Millions of numbers carved in glass represent the tattoos forced upon victims.

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

This beautiful architectural gem was the first waste treatment facility in Boston.

What was once a true peninsula has now been filled in, causing the water to recede and leaving many streetside "waterfronts" and landlocked "islands."

A tiny plaque marks the location of the water source that facilitated the birth of modern-day Boston.

This small glass cube is a peaceful out-of-the-way sanctuary at the busy airport.

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.

These whimsical works of art tell the story of the city's past and present.