America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

A terrific purveyor of natural history objects and curios.

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

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

The only home that Alexander Hamilton ever owned has a history almost as troubled as his own.

From scholastic to sepulchral - now under reconstruction.

Little Red Lighthouse under the George Washington Bridge.

The mummified relics of an American missionary.

The first "Hall of Fame" in America was designed by legendary Gilded Age architect Stanford White for what was then the NYU uptown campus.

The studio of influential composer Charles Ives is perfectly reconstructed, hidden in the back of the American Academy of Arts and Letters.

The highest point on the island known for buildings that touch the sky.

A Manhattan Episcopal church with an eerie underground crypt.

This abandoned caretaker's apartment is one of 13 left in the New York Public Library system.

A crumbling staircase in upper Manhattan is all that remains of one of the most important sites in sports history.

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

The legendary court where emerging basketball players gain their street cred.

The oldest house in Manhattan is now a museum that remembers the home's sordid history of scandals, vice-presidents, and ghosts.

This Bronx apartment building is officially recognized as the birthplace of hip-hop.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

An absolutely beautiful 200-foot stained glass installation traces the evolution of knowledge.

The unbelievably opulent home built for an infamous newspaperman.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

The oldest still-existing mosque in the United States sits in a remote prairie in North Dakota.

A sweet symbol marks the place where torturous executions were once carried out.