Deep under Manhattan is the largest construction project in city history. So far, the project has taken the lives of 23 workers, or "a man a mile."

Volunteer-run library dedicated to exploring five decades of activism history.

Named the fifth most beautiful building in America in 1885, this former courthouse boasts the best view in the Village.

A popular European tradition makes its way to the states on one of America's most famous bridges.

Behind a bodega is a small museum of relics and ephemera showcasing the history of New York.

This 13th-century monastery chiseled into the side of a mountain is equipped with a bridge that can be lifted to protect against raids.

Webcam that broadcast the hatching of Bald Eagles to millions of viewers.

A beautiful waterfall and beach where precious stones are plentiful.

Ice roads, deep holes and 3,500 pounds of diamonds.

This vast, pristine wilderness is home to a rare subspecies of black bear.

The water swaps direction twice a day, whipping into a frenzy of whirlpools and rapids.

Unlike many reclaimed, abandoned mines, this Canadian cave system is still just a dangerous maze.

The frozen bubbles that form on the icy surface of this Canadian lake contain enough methane to create a small explosion.

Every four years, millions of salmon fill a river so densely that its waters appear deep crimson.

Earth's greatest purely vertical drop at 4,101 feet.

A hiking area billed as a possible home to Bigfoot.

The highest tides in the world come in and out here twice a day, allowing you to essentially walk along the ocean floor.

One of the foremost Sherlock Holmes collections is hidden away at a Toronto library.

A high point in Vancouver kitsch.

Fossils, railroads, and waterfalls!

Defying all odds, this lonely little tree found a home on a log sticking out of a Canadian lake.

The Victorian-era greenhouse is stuffed with tropical plants, and open 365 days a year.

Railways may have forged this quintet of lovely tunnels, but now they are open to hikers.

A botanically themed auditorium blooms within the world’s last operating double-decker theater.