The purported world's shortest international bridge connects a homeowner in Canada to his backyard in New York.

A castle built for love, and abandoned due to heartbreak.

This tiny little island has, as the name says, just enough room for its single house.

This Art Deco fortress in upstate New York gives Manhattan's vaunted examples of the style a run for their money.

Dedicated to the art and science of glass in equal measure, this space is as much laboratory as museum.

The first piece of public art dedicated to LGBT rights.

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

Among the oldest structures in Madrid, these Moorish walls once guarded the medieval city of Mayrit.

This gorgeous beach hides behind two headlands in Oregon's Ecola State Park.

Frank Lloyd Wright built this suburban synagogue late in life, but it stands among his most iconic masterpieces.

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

An antique narrow gauge railway line still running through the Colorado and New Mexico mountains.

One of the most elaborate displays of Jellyfish is on display at the aquarium.

Step back in time on this preserved 1800s farm.

The U.S. Supreme Court's secret Cold War relocation facility in the mountains of North Carolina.

The highest point in North Carolina and the United States east of the Mississippi River, Mount Mitchell is named after argumentative explorer Elisha Mitchell.

This high point in the Great Smoky Mountains is said to be home to the chief of all bears.

One of the largest trees of its kind in California.

This hidden gem of a garden has one of the only surviving Victorian ferneries in America.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

A bit of retro transportation flair preserved in the world's largest department store.

An ancient underground cultic temple where sunlight penetrates on the summer solstice.

A rare tour of a commercial jet assembly plant, held inside one of the largest buildings in the world.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.