Elevated freight railway turned wildly successful urban park.

Once called the "Polish Gold Coast" it is an icon of the neighborhood that bears its same name.

A display of magnificent stained glass windows is the first exhibit of its kind.

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

A gothic church spire sits atop this skyscraper, the tallest church in the world.

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

An artificial hill and apparent calendric structure built in the Early Middle Ages immortalizes a legendary Polish princess.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

Fantastic views and thousands of love locks.

D.C.'s first central library was born out of a chance encounter with the philanthropist whose name it bears.

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

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

The "lovely red Vega" of the legendary record-settling pilot.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

The walls of the iconic dome are hollow and have a secret stairway.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

A haunting tribute to pioneering photographer Clover Adams.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

This grand gothic brewery has been pumping out suds for over a hundred years.

Home to items never before seen by the public.