This southwest-styled home in Santa Fe claims to be the oldest house in America thanks to an ancient bit of foundation.

This innocuous New Mexico storefront was once the secret jump-off spot for Manhattan Project scientists.

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

What was meant to be a temporary exhibit is now a permanent fixture at the St. Louis Zoo filled with beautiful birds.

This titanic oil company sign is a reminder of the Americana boom of the 1970s and also its commoditization.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

New York's unstoppable progress turned this cemetery into the smallest burial ground in the city.

The oldest operating apothecary in the US has treated everyone from Thomas Edison to Mark Twain.

The former sign of this immortal music venue is just that--undying.

A hidden "place of interment for gentlemen."

Walk over a 150 year old manhole.

Named the fifth most beautiful building in America in 1885, this former courthouse boasts the best view in the Village.

Hidden in one of New York's oldest subway stations is the final remnant of the site of the bizarre Shakespeare Riots.

Revolutionary War casualties fill the only 17th century structure remaining in Manhattan.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

This curved Manhattan building was built to house the opulence of John D. Rockefeller's oil empire.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

Once the tallest building in the world and the site of “the highest dinner ever held in New York” this building now holds the most expensive penthouse in the city.

An accidentally hidden library containing the ephemeral history of New York.

The very first subway station in New York City is beautiful, decked out in chandeliers, and ... abandoned?

Currently housing a corporate bank branch this building at the southern tip of Manhattan was once the gateway to luxury vacationing.

Magnificent New Deal Murals evoke a time when New York City harbor was one of the world's greatest and busiest ports.

Built hundreds of years ago this downtown iron barrier once protected a much despised king.