The final resting place of the great navigator, or maybe his brother.

The world's largest wooden structure.

The oldest continuously inhabited street in America.

The remains of the furnace and iron works that produced the massive Hudson River Chain still stand in the woods of New York.

Reclaimed by nature, the ruins of Doodletown, New York are remnants of a town consumed by a state park.

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

A castle from the Holy Roman Empire that hosts traveling youth... in its stables.

This abandoned coliseum was intended to be a grand Nazi rallying ground before it was halted at the end of the war.

The "feral child" who appeared in Bavaria in the 19th century remains as much a mystery as his unsolved murder.

The largest and most famous wax anatomical collection anywhere in the world.

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

Small ship votives hang from the vaulted ceiling of this port-side church with a Latin inscription on the wall.

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

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

One of Canada's oldest museums, the beautiful Redpath has been serving up Natural History and Ethnography since 1882.

City law dictates that this mountaintop cathedral containing the heart of a saint is to remain the tallest building in town.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

One-time largest man-made structure in the world will be a park in 30 years.

A town trapped in time - 1958 to be exact.

Mysterious 500-year-old tapestries depict a unicorn hunt.

The first "Hall of Fame" in America was designed by legendary Gilded Age architect Stanford White for what was then the NYU uptown campus.

Little Red Lighthouse under the George Washington Bridge.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

Manhattan and the Bronx have been playing tug-of-war over this former island neighborhood for more than a century.