This miniature feudal castle was built on a whim to honor a US Navy pioneer.

The massive Roman arch in New Hampshire that was meant to be a tomb.

Generations of rockhounds got their start at this beloved, historic mine.

An Olympic hero stripped of his medals is buried in a town he never visited, which took his name after his death.

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

A mine fire has been burning under the deserted town since 1962, but this church is still going strong.

In which a local geological marvel becomes a quaint roadside attraction.

This eerily well-preserved coal town was saved from destruction by a Sean Connery movie.

A toxic ghost town sitting atop a massive coal fire.

The highest peak in the state of Vermont has some interesting features.

This memorial in the Adirondack wilderness honors the accidental death of a Scottish entrepreneur.

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

The oldest continuously-operated inn in the United States, once owned by Henry Ford.

This colorful gate stands as an entrance to the walled city of Old San Juan.

A magnificent waterfall nestled in the heart of the El Yunque National Forest.

The world's brightest bioluminescent bay.

This huge pile of volcanic boulders hides a stunning network of secret grottoes.

Rusting, graffiti-covered tanks litter the beach of this island, once used by the U.S. military for target practice.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

Experience a charming 1930's version of "infotainment."

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

This tiny, painted door at the base of a tree stump has been a fixture of the Harvard University campus for decades.

In a town that's had a whole lot of giant chairs this one still stands tall, just not the tallest.

In the middle of a New England forest sit the crumbling ruins of World War II-era ammunition storage bunkers.