This massive blockhead sculpture hides an entire library.

Carved faces add a touch of magic to this island's impressive oak trees.

A large instrument played by the wind.

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

While not recognized by Guinness, this chocolate waterfall is likely to be the world's largest.

This lab's maddening silence is good for business but bad for sanity.

Giant busts of 42 U.S. presidents are sitting in a field in Virginia.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

A large camera obscura, constructed entirely from digitally fabricated components.

A semi-scholarly approach to sex.

A room in New York City that contains 250 cubic yards of dirt worth a million dollars.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

The site of the first couple's first kiss is commemorated by the most adorable presidential monument ever.

This historic hotel invented the chocolate brownie.

Each of these gorgeous, intricately decorated rooms is painstakingly crafted to the scale of 1 inch: 1 foot.

Combination beer garden and music venue in the heart of Wicker Park.

Beloved bar home to musicians of all eras and reputations.

This massive World War II calculator hearkens back to the days when "computer" was a job title.

Located in a beautifully restored ice house, this museum is the result of decades of hard work and devotion to the craft of plumbing.

Eclectic collections, artwork, and some feline friends fill the writer's former home.

Palatial mansion estate used in films including "Flowers in the Attic" and "The Witches of Eastwick."

Beautiful steampunk ghosts of early Massachusetts.

This giant Boston statue of Mary is standing on a globe to show her power over the universe.