The heroic sled dog of the 1925 serum run is preserved in taxidermy.

This shifting North Carolina sand dune is an odd little desert surrounded by oceanic forest life.

The world's tallest doric column is this Ohio monument to a naval victory in the War of 1812.

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.

The world's longest known cave system.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Collecting 700 years of mechanical death-dealing, the NRA's sprawling gun museum is a revealing testament to the American obsession with armament.

This Virginia railway overpass is said to be haunted by a serial killer in a rabbit costume.

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

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

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

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

Home to items never before seen by the public.

Prison made famous by The Shawshank Redemption has been out of commission since 1990.

The permanent home of Elektro, the celebrity automaton of the 1939 World's Fair.

An abandoned asylum incorporated into a college campus.