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

This abandoned sea fort has become an accidental bird sanctuary.

The maritime museum that boasts the largest nautical library in the western hemisphere.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

At 207 feet, one of the world's longest continuous escalators.

The resting place of a Civil War celebrity's amputated limb.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

An architect's childhood fantasy treehouse made real.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

A beautiful geyser under environmental threat.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A towering tribute to decisiveness stands on the spot where Brigham Young and his followers decided that this must be the place.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

Legends surround this jagged rock formation in the New Mexico desert.

Dramatic river bend surrounds a natural red-rocked pedestal.

Ancient pueblos built into the base of a natural canyon wall.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

See massive fossils that are over 200 million years old in northeastern Arizona.

This southwest-styled home in Santa Fe claims to be the oldest house in America thanks to an ancient bit of foundation.

A bronze statue dating back as far as 1252, still has remnants of gold on its right cheek from ancient gilding.

This handsome giant is said to mark the birthplace of the mythical woodsman and even had a cameo in a Stephen King novel.

The eccentric mansion of one of the most popular horror authors of modern times.

This Maine bridge may be the last wire-supported bridge of its type in the world.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.