One of the largest free-standing structures ever built, this dirigible hangar is now simply a giant skeleton.

A sealed test tube said to hold Thomas Edison's dying breath was given to the inventor's friend and mentee, Henry Ford.

These gardens recreate unique and endangered Michigan habitats.

Inside this museum, the history of the Walt Disney Family empire is on full display.

Oldest building in California still in use.

This museum started as a collection of Manhattan Projects and continues to add exhibits as they are declassified.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

The site of the deadly Triangle Shirtwaist Factory Fire.

Experience a charming 1930's version of "infotainment."

This roadside attraction has been serving out its fair share of hearty folklore and chaos since 1858.

A tribute to the life and work of the beloved "Peanuts" cartoonist.

The most beautiful Taco Bell in the world even has surfboard parking.

The rusting remains of the largest assembled WWII fleet on the West Coast.

One of the U.S. Forest Service's only mansions is outfitted with a dinner table for floating food.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

Andy Griffith's hometown has made itself up to look like the fictional town of Mayberry.

A wonderful display of arts and crafts handmade by local artisans in the Southern Appalachians.

Now abandoned, the first public health hospital in the U.S. saw more than one million immigrants from around the world.

The only surviving prototype for Buckminster Fuller's house of the future.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

A series of waterfalls and pools that flow through the 'Ohe'o Gulch and into the ocean.

Twenty-seven massive radio antennas on the high plains of New Mexico search for life on other planets.

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.