19th century cemetery hidden in Brooklyn's Prospect Park.

A way to take your secrets to someone else's grave.

A mass grave for victims of one of the city’s worst fires.

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

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

This giant boulder is sandwiched between apartment complexes in upper Manhattan.

The "Seinfeld" diner.

A Gothic-style abode built to accommodate the church's three resident peacocks.

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.

This castle-like building in Manhattan helped destigmatize cancer in the 19th century.

This unique house, the only one of its kind in Brooklyn, was built as part of a real estate developer's showcase.

These century-old townhouses contain some of the first car garages built in the United States.

A Collegiate Gothic quadrangle that surrounds an 18th century secondary school whose financing came from the likes of Alexander Hamilton and Aaron Burr, among others.

This elaborate tunnel is the first structure composed of cast concrete in the United States.

Herman Melville wrote 'Moby Dick' in this landmark 18th-century house surrounded by farmland.

This castle constructed in 1928 was crafted from drawings of Lismore Castle in Ireland.

The Jewish diaspora shares a menu at this museum café.

Classy up your Big Mac with bow-tied servers and chandeliers at the world's fanciest McDonald's.

The world's only and thus largest collection of its kind celebrates everyday wonder through simple umbrella sheaths.

This statue commemorates the importance of hat manufacturing to Danbury, once known as the "Hat City of the World."

A statue commemorating a 16-year old girl's nighttime ride to raise a militia against attacking British troops.

A record-size collection of wild-haired troll dolls tells the story of the mythical creature's roots in Scandinavian folklore.

A giant lumpy candle serves as a beacon for this highly scented pit stop.

The inventor of a number of hybrid corn species is immortalized with a field of giant corn.