These subterranean storage areas hold emergency water reserves.

Faceless white figures loom over the city from the rooftop.

A free, public museum dedicated to the fascinating science of sight.

A former plant in one of the hubs of U.S. steelmaking has been turned into this museum celebrating the history of American industry.

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.

A tribute to those that perished during the American Revolution.

One of the world's oldest continually operating bookstores.

In use from 1742 to 1910, only flat headstones were allowed in this cemetery.

George Washington, Alexander Hamilton, and Benjamin Franklin all slept at this humble inn.