The illuminating collection of L.A. street lights is run by the city and only opens one day per month.

If drivers cross the rumble strip on this stretch of Route 66 at just the right speed it plays "America the Beautiful."

This unacceptably tall building was the real reason for Washington, D.C.'s skyscraper ban.

The oldest orange tree in California spawned a generation of citrus farmers.

Tucked behind the Institute of Neurological Science down a decrepit street resides the largest display of human brains in Latin America.

The largest medical and anatomical collection in France lies hidden from the public.

Over 9,000 brains collected between 1945 and 1982 demonstrate the results of untreated mental illness.

A collection of 100 brains preserved in jars on the UT campus.

This collection started by a Cornell professor once held more than 600 human brain specimens, including the one that belonged to its founder.

Brain collection and database that narrows the gap between man and animal.

An archival collection of over 2,200 case studies which includes human brain specimens and tumor specimens.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

This unique building in the main square stands out among the city's typically Baroque architecture.

This tiny, painted door at the base of a tree stump has been a fixture of the Harvard University campus for decades.

This is the house that spite built.

This hidden green space is the city's second largest conservatory.

The outcropping is graffitied with the name of the beloved musical Muppet television series.

The oldest surviving botanic garden in the United States.

A strange, heartwarming, decades-old declaration of love on a New Hampshire roadside.

A tribute to the little-known group of women who were the first ever to fly aircraft in the U.S. military.

A quirky collection of figurines backdropped by city views is hidden next to a popular restaurant in the Hollywood hills.

The lab where the scientist made his groundbreaking discoveries is preserved on the basement floor of the Faraday Museum.

The first park built over a freeway is a brutalist masterwork.

A 6th-century stone lies at the site of the mythical battle waged between King Arthur and his nemesis Mordred.