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

Olfactory delights in San Francisco's Botanical Gardens.

A winding path built in secret on the edge of the continent.

A still functioning vaudeville carousel that has operated for over a century boasts a colorful menagerie and past.

A nondescript building that's been functioning as a speakeasy for nearly a century and a half.

A small 12th-century temple surrounded by waters believed to have curative properties.

A battle between nature and architecture in the Cambodian jungle.

Walk through a clothing store, across a courtyard, and up several flights of stairs for delicious coffee with a side of beautiful views.

The spot where the two men ate together now stands enclosed in glass.

Home of the unusual art of water puppetry, one of Vietnam's oldest curiosities.

The notorious "Hanoi Hilton" where Vietnamese colonial subjects and later American POWs, including John McCain, were imprisoned.

Twice a day a speeding train passes only inches from the homes of this residential neighborhood.

Oldest existing church in New York and the inspiration for Washington Irving's "The Legend of Sleepy Hollow."

The monument dedicated to Phineas Gage in the town where his accident happened.

A bygone village occupation lives on via this quaint public chalkboard.

This surprising gem is a world-class archeological museum hidden at the University of Chicago.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

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

The park that the Chicago Stockyards built.

Mysterious 500-year-old tapestries depict a unicorn hunt.

A large boulder marks the place where the island of Manhattan was purportedly "sold" to the Dutch.

Small monoliths of several varieties of stone sit alongside a wooded path in the Bronx.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.