Possible relics of the ancient Roman city are hidden in this restaurant's façade.

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

A large camera obscura, constructed entirely from digitally fabricated components.

In the power of this waterfall, Alexander Hamilton saw the potential for industry.

A historic covered bridge, only one of two remaining in North Carolina.

I-95's Tijuana-style celebration of kitsch at the Carolina border.

An enormous artwork that colorfully celebrates over 150 years of US military achievements.

One of only two remaining Victorian-era greenhouses in New York.

This outdoor gallery of graffiti-covered walls pays homage to the past, present, and possible future of street art.

A Victorian cemetery in the heart of Brooklyn remains a popular mecca of morbid curiosity.

Detailed facade of a brownstone in Boerum Hill.

A bit of retro transportation flair preserved in the world's largest department store.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

A popular European tradition makes its way to the states on one of America's most famous bridges.

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

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

100 massive sculptures in the Hudson River Valley.

The only remaining historic maritime signal station in the United States.

Walk along the medieval fortifications that have been protecting Tallinn since the 14th century.

During the Soviet era, the spire of this longstanding church was used as a radio transmission tower.

This century-old bakery produces 18,000 loaves of traditional Cuban bread every day.

These winding paths and vertical ramps have been inspiring skateboarders for nearly half a century.

This historic house museum that celebrates one of the world's most influential social reformers is also one of the most haunted locations in Chicago.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.