One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

The 28,000-year-old specimen is remarkably intact.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

The largest puppetry museum in the United States houses the world's most complete collection of Jim Henson artifacts.

This phone booth-sized municipal building has been a piece of police property for more than half a century.

At Chicago's revered Field Museum, visitors are invited to learn about and literally explore DNA.

Former meatpacking facility turned vertical farm and sustainable business complex.

The subtle science of a master molecular gastronomist.

"The Donut" was built as part of an expensive, ill-fated engineering endeavor.

The English town of Mansfield likely got its name from this enigmatic breast-shaped mound rising abruptly from the earth.

An enormous, inside-out glass globe built in 1935.