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.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

Metro station with a claim to rock n' roll fame.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

By day this New Orleans square is for pedestrians, but by night it is a kingdom of kittens.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

Residents of Fremont in Seattle have considered it the center of the universe since the 1970s.

This landmark cemetery in Boston was created more than 300 years ago.

Largest lake in Great Britain measured by surface area.

The modern birthplace of Irish freedom.

Once called the "Polish Gold Coast" it is an icon of the neighborhood that bears its same name.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.