42nd story Pyramid shaped penthouse tops Seattle's oldest skyscraper.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

Every year, over 25,000 monarchs overwinter in Pacific Grove.

This former Roman Catholic Church still contains the embalmed hearts and organs of 22 popes.

A desert ghost town—occupied for only 12 years—was once home to more than 500 silver mines.

This turn of the century masterpiece has a mysterious goaty interloper.

It's not your typical library, memorial, or book store.

The former Naval shipyard is open for exploring - mostly.

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.

The site of a tragic massacre that spawned a multimedia franchise.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

A burnt orange monolithic dome structure perched on a hillside near Interstate 280.

Early prototype for Frank Lloyd Wright's Guggenheim.

Breathtaking and huge 430 year old maps of Italy.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

An optical illusion found amid a logged redwood forest.

Go inside to really appreciate this 500-year-old technological masterpiece.

Commonly referred to as the most photographed Victorian home in the United States.

The haunting ruins of Jack London's dream house.

This massive redwood tree has a hole in the base big enough to drive through.

A house built from trash known as the poor man's Hearst Castle.

The fossilized remains of ancient California redwoods.

The end of the 4 Line is also the end of the line for 300,000 souls in one of NYC's most illustrious cemeteries.