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

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

Home to items never before seen by the public.

This landmark cemetery in Boston was created more than 300 years ago.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

A beautiful Victorian-era cemetery, complete with a miniature village.

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

An enormous, inside-out glass globe built in 1935.

Obscure Freemasons still live in D.C.’s largest private residence.

This house was once the location of Frelinghuysen University.

A spectacular tribute to statesman and philanthropist Andrew Mellon.

The grand marble structure next to the White House is Andrew Carnegie's temple to Pan-American diplomacy.

This grisly headstone doesn’t seem to be resting in peace.

A piece of crumbling highway infrastructure was repurposed as a high-tech facility for testing racecars.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

A Beaux-Arts triumph set to become Ford's innovation campus

All of Chicago's wood-paved streets are long gone but two alleys remain.

A hollow cement depiction of time's inexorable effect on the human body.

A lush green oasis in the middle of Chicago.

Nonprofit art center that promotes outsider, intuitive, and self-taught art.

The pieces in this sculpture garden are made from demolished buildings that were once landmarks of Motor City.

On the right bank of the Grand River a plaque remembers an imaginary painter who once awaited his youth.