A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

Neo-cave art on the macro scale.

In terms of history and architecture, this is one of the most remarkable cemeteries in the world.

A focal point of the Cuban government, this city square features one of the most iconic images in the country.

After the Cuban Revolution, the famous rum company had to leave their swanky headquarters behind.

His music once banned in Communist Cuba, John Lennon is now immortalized in bronze by Castro, who considers Lennon a "fellow dreamer."

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

An artist's cute bronze subway sculptures belie his violent artistic past.

The most confusing clock in New York.

Avoid gangster interaction while window-shopping.

A WWI fighter plane and turn-of-the-century penny candy shop are among the unexpected features of this Financial District building.

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

A clock set into the concrete outside a Manhattan jeweler has been telling time underfoot for over a century.

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

Two flush headstones mark the only known graves to be embedded in an airport runway.

This recently rediscovered Civil War-era submarine was the first to ever sink an enemy ship.

South Carolina's last remaining slavery auction house is now a museum devoted to its own tragic history.

Once the most flame resistant building in the country, the South Carolina Historical Society building was almost burnt down in a fire.

Oldest unrestored plantation house in America that is open to the public.

The language and heritage of a nearly forgotten culture can still be explored in this Southern enclave.

One of Savannah's oldest and most haunted cemeteries, featuring graves desecrated by Sherman's Union Army.

This quirky curiosity shop takes its cues from the world's bazaars.

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