The secret medieval communication system will whisk your words above the noise of the crowd.

Condemned US Navy seaplane control tower turned officers’ club sits atop Yerba Buena Island.

Deco Modern sculptures of the people of the Pacific, cast for the 1939 Golden Gate International Exposition.

An enormous artwork that colorfully celebrates over 150 years of US military achievements.

Each summer, the migratory bats living beneath the bypass form "batnadoes" at dusk.

Where a staggering 747 ships were constructed during World War II.

This mountaintop beacon is only lit three times a year but shines like some kind of all-seeing eye.

Where the first "expert riders, willing to risk death daily" for the Pony Express were recruited.

A historic hotel in an old California railroad town with a rowdy reputation.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

In the middle of an extremely unforgiving and desolate high desert is the most secret military facility in the world.

Hellam Township is reputed to feature seven remote gates, which when passed through in the right order, open an entrance to hell.

An abandoned stretch of highway, deteriorating next to the operational one.

Former laboratory of radical psychiatrist Wilhelm Reich.

The first bridge observation tower in the U.S. offers one of the best views of Maine.

This 19th century granite fortification is one of the most well preserved forts in New England.

The most photographed house in Maine looks good enough to eat.

New England's tallest light house stands on an island with a history of cannibalism and death.

This colorful theme park dedicated the official fruit of Maine serves sweet, tasty treats.

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

An otherwise quiet campground becomes a bustling medieval town for two weeks every year.

Behold the rickety wooden glory of the world's oldest operating roller coaster.

The oldest farmer's market in America is so ancient it was approved by the King of England.

The house that Frank Lloyd Wright "(shook) out of his sleeve at will" at the age of 86.