This shale formation along the Appalachian Trail once inspired the third president of the United States.

Built in the 1850s, this church was of the first five churches constructed in Harper's Ferry.

More than a century old, this trading post resides in the Navajo Nation.

The final resting place of the most famous outlaw in the Old West.

Recorded as the first person buried in Arlington Cemetery.

Though his role as the inventor of baseball may be up for debate, fans still festoon Doubleday's grave with baseballs.

A beautiful Gilded Age hotel in the White Mountains with surprising diplomatic history.

This cathedral dedicated to Louis IX, sainted King of France, holds many secrets.

A gift from Scotland to the United States in memory of the 270 lives lost when Pan Am Flight 103 exploded over Lockerbie due to a terrorist bombing.

When it was built in 1929, this historic bridge was the only place to cross the Colorado River for 600 miles.

Before it was buried by volcanic ash, this fast-food restaurant fed the hungry hordes of ancient Rome.

This museum is dedicated to the history and design of purses.

A famous songsmith's custom piano, dubbed "High Society," is hidden just out of sight in one of New York's finest hotels.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

If it hadn't been caught in time, a flaw in the design of this Manhattan skyscraper could have led to its collapse.

Taking the subway here means doing so over a bridge located in the middle of an estuary.

An ancient art form is kept alive in this corner of Nepal.

This 100-foot tall tombstone memorializes victims of 40 years of nuclear testing in Kazakhstan.

A colorful, century-old cemetery of the Yaqui Indian Tribe hidden amid the suburban sprawl of Tempe, Arizona.

A spectacular tribute to statesman and philanthropist Andrew Mellon.

A striking memorial to the 21 lives lost in an explosion at the Washington Arsenal

Semaphore saints, a golden dragon's head, and a stone carved with religious warnings all call this cathedral home.

This Native American settlement dates back to the Pueblo II period.

Considered by many to be one of the most dangerous highways in Alaska.