Once called Winthrop Park in 1889, home to a decidedly sexy tribute to the Monitor vs. Merrimac battle.

A drawbridge named for a potentially intersex Polish national who fought alongside George Washington during the American Revolution, and an example of "Pulaski Red".

Two New York rooftops are home to the largest rooftop soil farms in the world.

A crumbling hospital from the 1850s on Roosevelt Island.

Piano-making empire filled with 200-year-old steam machines still churning out 1,000 instruments a year.

A discreet little stairway on St. Nicholas Avenue leads to a quaint and unexpected cobblestone street of 19th century wooden rowhouses.

The most confusing clock in New York.

Red frames showcase remnants of one of New York's original subway stations.

New York City's smallest piece of private property.

Try not to get slimed in Tribeca.

Avoid gangster interaction while window-shopping.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

Manhattan's lighthouse, erected at the insistence of the unsinkable Molly Brown.

Fortified homes of highland warriors that are still in use today.

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

Romania's triumphal arch looks out over Bucharest.