The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

Amidst the bustling streets of Dublin, there is a hushed garden that is dedicated to "All those who gave their lives in the cause of Irish Freedom."

New York City's only wildlife rehabilitation center treats more than 3,000 feathered and furry patients each year.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

Elevated freight railway turned wildly successful urban park.

Try not to get slimed in Tribeca.

One of the longest water bridges in the world was built over a supposedly haunted swamp in Louisiana.

The 19th-century pharmacy (now a used bookstore) was featured in James Joyce’s "Ulysses," and has changed very little to this day.

A beautiful but toxic fountain of mercury.

Climb inside an iron crystal magnified 165 billion times its normal size.

The statue of John Harvard isn't actually John Harvard—or even, technically, the founder of the school.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

The 28-foot granite map plots the locations of 40 theaters in New York City.

A mysteriously dark cemetery monument fuels stories and legends galore.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

A hands-on traveling collection of the innovative devices of yesteryear.

A place to eat for on-the-run agents and espionage enthusiasts.

Become a prohibition rebel.

At Chicago's revered Field Museum, visitors are invited to learn about and literally explore DNA.

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

At 207 feet, one of the world's longest continuous escalators.

The first and only carousel with a lineup entirely of insects.

The site of Paul Revere's historic two lantern warning.

The highest point in Washington state is a volcano covered in glaciers.