One of many reminders of Tesla's scientific contributions overlooks the falls which inspired him.

Watch the newest land on the planet form before your eyes.

These tourist trap caverns are said to be the former home of a legendary Pennsylvania Hermit.

Once America's tallest structure, now a Baltimore landmark.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

Impossibly life-like natural history models created out of glass by a father and son.

Mountain where Jesus was first tempted by the Devil.

Montreal's giant farmer's market is a foodie's best friend, especially in the winter months.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

An extensive collection of ancient Egyptian artifacts and mummies.

The romance of early commercial flight still fills this Art Deco destination.

Historic Hull Street was actually the first street with a proper name in the Boston area.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

Once the largest windmill outside of Holland, with enormous 114 foot sails.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

Concrete strongholds stand guard over the Golden Gate.

Former villa and estate of James Deering developed to preserve native tropical forests.

Legend has it the commander of the defenders drew a fateful line in the dirt with his sword just before the final battle.

An elaborate gift from Claus Spreckels is now a piece of San Francisco history.

San Diego's most historic and haunted home.

Oldest building in California still in use.