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.

The absurd creation is a compulsory destination for selfies in Buffalo.

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.

Ancient ruins hidden underneath a modern luxury hotel.

The "Greatest Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

No monkeying around, this fountain was really named after the classic sci-fi film.

The former estate of the Guggenheims, part of the opulent Gold Coast that inspired the Great Gatsby.

An eccentric playboy's astounding natural history collection.

This museum-within-a-museum pays tribute to "The World's Most Experienced Airline."