This historic building housed the surviving crew members of the Titanic, who were left destitute after the wreck.

This exemplar of modernist architecture is meant to captivate and inspire students of the Cooper Union.

Unrepaired walls from a 1920 anarchist bomb attack.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

Great place to have a drink and a bite to eat in an atmosphere laden with New York's Bohemian past.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

One of only two commuter aerial tramways in the United States.

Elevated freight railway turned wildly successful urban park.

A crumbling hospital from the 1850s on Roosevelt Island.

Never actually a tree at all, this spot was the site of London's public hangings for nearly 600 years.

An ancient Roman temple first dedicated to an emperor's wife is now a church.

In the early Roman Empire, people deemed traitors and criminals were tossed to their deaths from this rock.

This large, circular tomb is the final resting place of the first emperor of Rome.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

Many Hindus make the long pilgrimage to this holy city to have their remains burned on the banks of the Ganges River.

Known as the leaning temple, the sacred structure has somehow developed a severe nine-degree slant.

Time has stopped at the house where Gandhi died.

The mysterious empty cupola behind the monumental arch points to an ancient prophecy of Delhi.

A favorite haunt of Delhi's politicos and intellectuals, this old-school coffee shop was shut down under Indira Gandhi's Emergency.

A startling, centuries-old subterranean marvel hides in plain sight.

The site of an atrocity that would be used to justify Britain’s conquest of India.