Accessible only by boat, this centuries-old island fort never saw troops or combat.

A very big rock just plopped down in the New England woods.

A remnant of the last Ice Age, this lake is surrounded by fascinating rock formations.

Don't get it twisted: This is the oldest pretzel bakery in the United States.

Tourists often confuse this beautifully ornate former cigarette factory for a mosque.

This Dresden church was purposely rebuilt Protestant after being demolished in World War II.

The bridge that cost Germany a World Heritage Site.

A unique hanging cable-car navigates through Dresden, the oldest suspension railway in the world.

A New Hampshire grave with a grudge.

These ruins have been linked to a sherbet factory that exploded, but the story may be entirely fictional.

Honorable ranks graduating from the prestigious Army War College work hard to maintain their high standards of honor and erase those who don't.

In the back of a bustling factory lurks a quiet museum honoring the history of Canadian sugar manufacturing.

This unusual structure may be on its way to becoming a cultural landmark in Toronto.

This "Palace of Purification" has made many film appearances as a dark and sinister headquarters.

The longest enclosed pedestrian bridge in the world spans 14 lanes of traffic and six rail tracks, all while lighting up the night sky.

This picturesque stream was up until recently the site of a ten story mountain of slag and sewage.

These disused steel furnaces are now haunting ruins that may one day be a national park.

This icon of the Atomic Age now lays dormant.

An abandoned Cold War missile radar site.

A relic of the Cold War tucked away in the forested hills above Bratislava.

This field of concrete was once an active defense site armed with nuclear warheads.

A relic of the Cold War in Chicago.

Solving a 60-year mystery finally gave a name to the young woman known only by the color of her clothes.

One lonely, modern pyramid has gone from corporate think tank to deserted boondoggle.