FDR's Art Deco hospital tower was hopelessly inefficient.

The first of Lancaster's "rural cemeteries."

This Delaware River bridge is emblazoned with a catty slogan from a more prosperous time.

Yo, Adrian!

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

An original apothecary from 1792.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

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

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

A former major munitions plant that has been converted into a sprawling art space.

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

Macabre astrological automaton clock dating to the late 1400s.

Beautiful Gothic-inspired lighthouse stands out among the run-of-the-mill striped fare on Bodies Island.

A downtown park built on top of unclaimed graves.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

Look closely and you’ll notice that the color changes a third of the way up the tower.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

A recreation of the doomed ocean liner in the middle of the Smoky Mountains.

The curiosities and wonders of pharmacy in a delightful historic building.

This symbolic piece of New Orleans architecture is also home to a few ghastly stories.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.