Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

The institution is sitting on a goldmine of 21,000 paints, varnishes, pigments, and primers preserved for posterity.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

A Spiritualist house of worship where believers communicate with the dead in the spirit world.

A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

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

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

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

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.

A European-style bath house in Chicago.

A Museum of Holography frozen in 1974.

What was once one of the country's largest confectionary plants is now an abandoned ruin, but is still pretty sweet.

A Chicago Movie Palace Lost to Time.

A beloved Chicago music venue offering cold beer and lots of “Friendly."

Built to house a chapter of the Knights Templar, this grandiose building is a relic of Freemasonry in Chicago a century ago.

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

This tower in a small Polish village uses the power of a sacred bell to ward off mischievous weather spirits.

This impressive mansion in Vinegar Hill has some mysterious details in its architecture.

A cargo of beautiful music.

The first piece of public art dedicated to LGBT rights.

One of the oldest Jewish cemeteries in the city, it is now overgrown with an urban forest.