The world's second largest single-dish radio telescope, once used to contact E.T.

The largest earthwork effigy in the world.

This pebble beach is so beautiful that taking its rocks is against the law.

Constant erosion has created a surreal landscape of bleached and preserved fallen trees.

You can find America's highest suspension footbridge at Grandfather Mountain in North Carolina.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

Enjoy dishes that founding fathers once ate at this Colonial Williamsburg pub.

Ancient pueblos built into the base of a natural canyon wall.

A spiritual vortex among the red rocks in Sedona.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

A forgotten Cold War relic hidden in the outskirts of a Wisconsin city.

A unique botanical garden housed in three giant geodesic domes.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

The hallucinogenic center of the ancient world.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Ancient snack bar of the Roman Empire re-opened.

A little sculpture with a large wardrobe.

This enormous "cloth of the conquest" depicts the Norman invasion of England in mind-blowing detail.

Remains of the artificial harbours invented for the Allied invasion of Normandy can still be seen at sea.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Northern Ireland's Brobdingnagian stepping stones.

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

The ancient tomb acts as a calendar that keeps perfect time.