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

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

The stone labyrinth in this New Orleans city park was laid to symbolize healing in the wake of Hurricane Katrina.

This knobby, drooping New Orleans oak is a favorite place both for climbing and for meeting giraffes.

The second oldest continuously operating bar in Louisiana.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

France's most famous cemetery, with some of its most curious tombs.

The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

This elaborate towering structure was once famed for its revolutionary height.

The first American department store, and home to the largest operating musical instrument in the world.

World's first "penitentiary," meant to be humane, drove men insane.

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

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

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

The most accurate timepiece in the world.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

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

Largest Roman Catholic church in North America.

A historic neighborhood church is reborn as a psychedelic arts collective.

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