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

A super-sized promotional trick that is now a D.C. landmark.

One of the largest artillery pieces in the world sits in a Washington D.C. parking lot.

The U.S. Navy’s preposterously detailed mini battleship took 77,000 hours to complete.

I-95's Tijuana-style celebration of kitsch at the Carolina border.

Daily lunch spot for many of Washington, D.C.'s cab drivers.

Decades before the scandal, this staircase on the river was a literal "water gate."

This sandwich shop has a century-old elevator behind a sheet of plexiglass.

Art deco landmark on the outskirts of Washington, D.C.

An unassuming, powerful monument north of the U.S. Capitol bears witness to the resilience of Japanese Americans during a time of grave injustice.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

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

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

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

This leafy estate is worth $18 million and is so grand it has two mailing addresses.

Largest Roman Catholic church in North America.

The house where John Wilkes Booth conspired with his co-conspirators.

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

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

Fittingly, America's museum of architecture is itself a magnificently designed old building.

A nostalgic bibliographic gem.

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

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

A painfully obvious spy house sits right across the street from the Russian Embassy.