America's greatest forgotten garden and the former stomping grounds of Son of Sam.

This once-grand marvel of engineering is now 41 miles of scenic hiking trail.

An eccentric inventor's castle home with its own indoor weather system.

In Gloucester, Massachussets, fishermen celebrate a successful year at sea by charging a lubed pole to capture an Italian flag.

A historic custom house with ties to George Washington is now a shrine to local nautical history.

One of the few brewers in the U.S. experimenting with hop-free beers.

Once the future of underwater combat, this old sub is now open for visitors to muck around in.

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

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

Explore the dark underground corridors of this graffiti-covered former military fortification.

A freighter full of exotic animals ends a harrowing voyage impaled on uncharted rocks in the Boston Harbor.

This piece of peacetime naval wreckage memorializes the tragic sinking of the USS Maine--an event which sparked the Spanish-American war.

This headstone-like marker inscribed with three words has been an utter mystery for over a century.

This natural Icelandic fissure allows divers to swim right between two volatile tectonic plates.

You can see three Irish counties from this Neolithic hillside fort, once the seat of the Kingdom of Ailech.

A retired military stronghold on the rolling green coast of Donegal.

British Empire's last territorial expansion, claimed by four countries.