Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

38-story baroque tower reflecting Detroit's rise, fall, and possible rise again.

One of the largest underground systems runs under Canada's largest urban center.

Headquarters of the world's fourth largest Hasidic sect and the first of many "770s" around the world.

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.

I fought the law and the precinct caved in.

World Trade Center memorial likened to a woman's sexual organ.

One-time largest man-made structure in the world will be a park in 30 years.

Failed state-supported institution meant to rehabilitate students with intellectual disabilities.

The fastest transatlantic ocean liner sat abandoned in a Philadelphia shipyard for decades.

An Irish Memorial commemorating those who perished due to potato blight.

A layered tribute to the work of mosaicist Isaiah Zagar.

The first American department store, and home to the largest operating musical instrument in the world.

The world’s first penitentiary, meant to be humane, drove men insane.

The haunting, dilapidated remains of a former poorhouse on Staten Island's Greenbelt.

Walk into the 19th century without leaving Brooklyn.

This impressive mansion in Vinegar Hill has some mysterious details in its architecture.

Abandoned 19th century homes once occupied by naval officers, soon to be demolished.

A decommissioned military complex that's now a modern industrial park.

The first declared National Monument in the United States.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

Check out the underground party scene at the "Burning Man of Brooklyn."

An illegally built ramshackle mansion tucked in the middle of Brooklyn is now being turned into condominiums.

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