This little blue house pokes out over the campus of UC San Diego, seven stories high.

More than 200 unconventional musical instruments that anyone can play.

Civil War Fort on an island in the Boston Harbor.

Quirky castle designed by the American actor best known for portraying Sherlock Holmes on stage.

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

Settled by the Church of Jesus Christ of Latter-day Saints in 1859, this abandoned frontier town has appeared in several films.

Tucked in a nondescript downtown Brooklyn mall is a bar containing a remarkable turn of the century anatomical wax collection last seen in 1920s Berlin.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

It specializes in outsider art and artifacts of secret societies.

"A hideous albatross in the Hudson River Valley."

This once-private estate is now a dreamy, meditative garden that's open to the public.

This weeping, 10-foot-tall sculpture was a maquette for a 9/11 memorial.

Enchanting gardens surround a derelict mansion, all hidden in plain sight behind a stone wall.

A blend of art, antiquities, and Americana fill this museum, surrounded by whimsical, enchanting gardens.

This splendid Versailles-inspired mansion has the largest French-style formal gardens in North America.

This collection of odd proofs of concept is like taking a walk through the imagination of a Victorian engineer.

A field of nothing but boulders which resembles a giant's gravel driveway.

One of the oldest surviving Swedish-American homes in the United States.

A scenic fort on the harbor protected Philadelphia from an attack that never came.

Step into Monet's world at this fine-dining restaurant in the middle of a New Jersey sculpture park.

This Delaware River bridge is emblazoned with a catty slogan from a more prosperous time.