The Pentagon sits on a former island that was in Virginia at low tide and D.C. at high tide.

Helen Keller once broke ground on this historic center for the study of technologies to benefit the hearing impaired.

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

The hidden offices underneath Memorial Bridge have been locked up since 1976.

A small token of gratitude from freezing cold journalists who were given a warm haven while covering JFK's inauguration.

The world’s largest Masonic temple was saved by the White Stripes.

The hottest, driest, and most scenic desert on Earth.

A beautiful collection of taxidermy birds and rare pomological wax models.

The eclectic seaside sanctuary caters to a rather fowl crowd.

This peaceful Sikh gurudwara serves around 50,000 free meals every day within its gilded walls.

A beautiful Arctic museum and nature center preserves the culture of the Sámi people.

An Art Nouveau gem hides beneath the layers of city grime obscuring this once-magnificent building.

Hundreds of stones dangle from barren trees in the middle of the desert.

The remains of the oldest synagogue in Britain lay forgotten for seven centuries, hidden under a humble shop.

A former mental hospital founded in the 1930s by a eugenicist who advocated for the forced sterilization of patients.

The only recreation of William Shakespeare's indoor playhouse.

Edgar Allan Poe's old dorm is now a shrine to the author's legacy.