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

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

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

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

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

The site of the climactic scene from the classic horror film is now a historic landmark.

Illegal drag racing two stories beneath Chicago’s streets.

These chunky stone towers out in Lake Michigan are the key to Chicago’s drinking water.

This urban drawbridge gained eternal pop culture fame when the Blues Brothers jumped it while it was raised.

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

Fragments of architectural wonders from around the globe are embedded in the newspaper building's walls.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

Home to a protest movement, a bombing, and a dramatic change in labor history.

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 little-known subterranean street runs under some of the best-known buildings in Chicago's River North.

Chicago's largest cemetery is full of beautiful Victorian monuments and more than a few ghost stories.

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.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

Cryptic messages embedded in the New York City sidewalk.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.