Chicago's North Park Village was once the largest municipal sanatorium in the country.

Cemetery featuring rare glass-fronted columbarium.

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

The world's only known button museum.

All of Chicago's wood-paved streets are long gone but two alleys remain.

A century-old hotspot for jazz, frequented by everyone from Charlie Chaplin to Al Capone.

A Bibliophile's Dream.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

This Central New York ghost town was once a prosperous railroad community.

This derelict building used to house infirm Freemasons, their widows, and orphans.

Inside this clubhouse is a cinephile's paradise.

In upstate New York, gorgeous waterfalls and a watermill are slowly being reclaimed by nature.

The library of every book lover's dreams.

This art center is way beyond your average pumpkin-carving operation.

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

A daily replay of the experiment that proved the rotation of the Earth.

A one-of-a-kind sundial at the Very Large Array honors a radio astronomy pioneer, incorporating the original piers from his breakthrough radio telescope.

A sculpture for the sun and stars, created by Nancy Holt.

This massive crater in the middle of nowhere was used to train astronauts for moon landings.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

A constellation of golden cobblestones shows the names of local children born under a full moon.

This unique historical monument features large concrete spheres designed to resemble fallen stars.

Eighteenth-century home, where Herschel discovered the planet Uranus.

This massive solar system model is sprawled out across Maine's suburban wilderness.