Touching mementoes from those who didn't make it back from World War I still hang in one of New York's oldest bars.

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

The only subway station in the city that still makes use of gap fillers.

There’s a hidden military meme engraved on the World War II Memorial.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

Surrounded by a verdant garden and a backdrop of ivy, a monument to beloved poet Khalil Gibran stands outside of the Lebanese embassy.

A historic arena where the Beatles played their first concert in the U.S.

At 207 feet, one of the world's longest continuous escalators.

The national park was once a plantation estate.

Outside the Department of Transportation, a collection of artifacts honors the history of how we get around.

Step into a pastel time capsule where candy is truly dandy.

The hallowed remains of a 900-year old Ancestral Pueblo great house.

She stares out across six lanes of traffic, clutching a musket and infant with determination.

A celebrity from the late Cretaceous period.

The only National Monument ever to go missing for nearly 50 years then resurface in a dump.

An 18-mile-long tunnel for sewage waste will soon wind within the bowels of Washington, D.C.

The span is crooked and made from two older recycled bridges.

A surprising, but overlooked example of geology in the middle of the nation’s capital.

A modest reminder of treacherous waters at the Golden Gate.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

This one-block alleyway is stuffed with street art that is colorful, cultural, and intensely political.

San Francisco's first World's Fair, dedicated to the wonders of California.

An elaborate gift from Claus Spreckels is now a piece of San Francisco history.

The key to turning shifting dunes into the green oasis of Golden Gate Park.